Commons:Open Access File of the Day

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Open Access File of the Day is an initiative of WikiProject Open Access. Since December 2011, it highlights files (or sets thereof) on Wikimedia Commons that are:

in the Public Domain (by ways other than copyright expiration) or licensed under CC0, CC BY or CC BY-SA
in Category:Open access (publishing) or any of its subcategories
used on at least three wiki pages outside user namespace, either on Wikimedia projects or on sites using InstantCommons, from the day of nomination until the day of posting.

Nominate a file or see nominations

The featured files

2013

May 21: Eccrine hidrocystoma, an adenoma of the sweat glands
May 20: Aptostichus barackobamai, the spider named for Barack Obama
May 19: The ground beetle Cymindis platicollis.
May 18: A saltwater crocodile equipped with a satellite transmitter for migration tracking.
May 17: Flowers of Silene species
May 16: Tiered rice paddies in the Baucau district, East Timor.
May 15: Podarcis pityusensis, the Ibiza wall lizard scavenging fish scraps
May 14: Ophiocordyceps unilateralis controls behavior of its host ants
May 13: human cortical development between 26 and 39 week gestational age
May 12: The snail Tamayoa decolorata.
May 11: A pair of Herennia multipuncta spiders.
May 10: events in alpha-synuclein toxicity
May 9: Pelochelys cantorii from Luzon in the Philippines
May 8: A male Craspedisia spatulata spider.
May 7: the greater noctule bat Nyctalus lasiopterus
May 6: floodplain around Lake Ira Lalaro in East Timor
May 5: love dart of the snail Bradybaena similaris
May 4: axon guidance in Drosophila
May 3: Copa kei male from Cwebe Nature Reserve
May 2: dispersal of seeds by the airflow of vehicles
May 1: holotype of Homo cepranensis
April 30: Granular corneal dystrophy, a condition caused by a genetic disorder
April 29: The microbiologist and Nobel laurate Hamilton Othanel Smith.
April 28: eggs of Pomacea haustrum
April 27: size of four Geosaurini present during the Kimmeridgian
April 26: optical flow experienced by a rotating observer
April 25: The soft coral Briareum violacea.
April 24: PET scan of a patient with nasopharyngeal cancer
April 23: lifecycle of Haliclystus antarcticus
April 22: predicted habitat suitability for the Illacme plenipes millipede.
April 21: The sea snail Terebra taurina.
April 20: a model for the early olfaction system
April 19: The blenny Helcogramma rhinoceros.
April 18: skeleton of the prehistoric Nimbadon lavarackorum
April 17: Cucujus haematodes habitus.
April 16: The polychaete Notopygos ornata.
April 15: Aquaporin Z, a protein
April 14: An Erebia sudetica butterfly.
April 13: An ass's ear abalone, Haliotis asinina.
April 12: calling song of Magicicada cassini
April 11: Bornella stellifer, a nudibranch in family Bornellidae
April 10: A Bradypodion gutturale chameleon.
April 9: The beetle Notiophilus aquaticus.
April 8: the fern Blechnum and tree Phylica on Gough Island
April 7: Shrimp Alpheus with parasite Cryptoniscidae attached
April 6: CT scan of lung showing Alpha 1-antitrypsin deficiency
April 5: schematic for a brain-computer interface
April 4: Enyalioides azulae, a member of the lizard family Hoplocercidae.
April 3: The blenny Helcogramma inclinata.
April 2: A mandible of the fossil giraffe Mitilanotherium inexpectatum.
April 1: A male Aptostichus angelinajolieae spider.
March 31: Sir Edwin Southern, inventor of the Southern blot.
March 30: The life cycle of the parasitic nematode Onchocerca volvulus, which causes river blindness.
March 29: Snoring under severe sleep apnea
March 28:T Cell differentiation
March 27: increasing reelin changes the morphology of migrating neurons
March 26: cone of female Ephedra californica
March 25: Life restoration of Iguanacolossus fortis.
March 24: Lily Shoals elimia
March 23: The beetle Phrypeus rickseckeri.
March 22: Pieter Bleeker (b. 1819), Dutch ichthyologist
March 21: Images of love darts made by scanning electron microscopy
March 20: The synaptonemal complex underlying bivalent formation during meiosis.
March 19: The song of the owl Otus jolandae
March 18: The moth Panthea acronyctoides.
March 17: Bone scintigraphy of a patient with psoriatic arthritis in the left elbow.
March 16: The Termitotrox cupido holotype.
March 15: Cercopithecus lomamiensis.
March 14: Phylogenetic tree for Heterobranchia
March 13: Endocarditis ultrasound
March 12: Malayatelura rubbing an ant worker
March 11: The fern Dryopteris macropholis.
March 10: Escherichia coli life cycle.
March 9: A Pantopsalis listeri harvestman.
March 8: Single beating cell at day 5 after VCAM-1 sorting
March 7: The result of a tonsillectomy.
March 6: A Prostylotermes termite.
March 5: Fruitbodies of Boletopsis nothofagi
March 4: Astronaut Charles Duke with a hammer on the moon
March 3: A Soay sheep.
March 2: In progeria patients, the cell nucleus has dramatically aberrant morphology (bottom, right) rather than the uniform shape typically found in healthy individuals (top, right).
March 1: The snail Opisthostoma everettii.
February 28: Adult Gelis apterus female in lateral view.
February 27: Affective psychosis, Hashimoto's thyroiditis, and brain perfusion abnormalities
February 26: Rolling of water droplets on quartz surface prepared using PMMA
February 25: The Sierra Madre on the Philippine island of Luzon.
February 24: The bivalve Xylophaga dorsalis.
February 23: The sea slug Aplysia punctata.
February 22: Rutilus x Alburnus - a natural hybrid of Rutilus rutilus and Alburnus alburnus.
February 21: Incidence of cholangiocarcinoma and Opisthorchis viverrini in Thailand from 1990–2001.
February 20: A Colias myrmidone butterfly.
February 19: The spider Selenops petrunkevitchi.
February 18: Frustules of several diatoms.
February 17: A patient's hands with multiple xanthomas.
February 16: Leukemia cells.
February 15: The sea urchin Asterechinus elegans.
February 14: The dinosaur Sinocalliopteryx gigas feeding on the bird Confuciusornis.
February 13: A juvenile Zodarion styliferum spider.
February 12: Monomeric and dimeric structures of human beta-defensin HBD-2.
February 11: The longhorn beetle Leptostylopsis annulipes.
February 10: Female cone of Ephedra intermedia.
February 9: Nobel laureate John Sulston.
February 8: Detail of a female Apocephalus borealis fly with its ovipositor.
February 7: The water snail Terebralia palustris.
February 6: The ground beetle Cychrus tuberculatus.
February 5: A newborn rhesus macaque imitates tongue protrusion.
February 4: A Plasmodium sporozoite transversing the midgut of an Anopheles stephensi mosquito.
February 3: A Tasmanian devil with Devil facial tumour disease.
February 2: Human embryonic stem cells and neurons derived from them.
February 1: Comparison of the huge claws of the extinct eagle Harpagornis moorei with those of its close relative Hieraaetus morphnoides.
January 31: Lectotypes of pleurocerids sympatric with Leptoxis compacta
January 30: A Common Myna.
January 29: A series of primate skulls, with brain size indicated.
January 28: Australian rock art depicting long-beaked echidnas.
January 27: Mating position of Latrodectus bishopi spiders (female in white, male in black).
January 26: The frog Boophis williamsi.
January 25: A digestive tubule cell of the sea slug Elysia clarki with chloroplasts (C) and nucleus (N). Scale bar: 3 µm.
January 24: Artistic reconstruction of Wintonotitan.
January 23: Song of the 17-year cicada Magicicada septendecula.
January 22: The ground beetle Broscus cephalotes.
January 21: The gastrotrich Thaumastoderma ramuliferum. Scale bar: 20 µm.
January 20: The lizard Kentropyx calcarata.
January 19: A human karyogram with a ring chromosome.
January 18: Atelopus franciscus territorial call
January 17: The butterfly Aricoris propitia attended by the fire ant Solenopsis saevissima.
January 16: zebra finch song
January 15: Oxydromus pugettensis, a bristle worm.
January 14: A Lamellibrachia luymesi tube worm.
January 13: The ground beetle Calosoma sycophanta.
January 12: Motion tracking of two pianists' fingers playing the same piece (slow motion, no sound).
January 11: Panoramic view of the Raja Ampat Islands, Indonesia.
January 10: Negative stain electron micrograph of a gamma phage. Used on 130 Wikipedias.
January 9: Glial distribution of Cu/Zn SOD immunoreactivity in intact immature brain
January 8: A congenital melanocytic nevus.
January 7: X-ray video of a female American alligator while breathing.
January 6: Trachemys adiutrix turtles in Lençóis Maranhenses National Park, Brazil.
January 5: Mourning Dove vocalizations.
January 4: A bumblebee worker with a transponder attached to its back, visiting a rapeseed flower.
January 3: Suggested "Out of Africa" migratory routes according to mitochondrial DNA.
January 2: Craig Venter.
January 1: Two specimens of the flatworm Pseudobiceros bedfordi about to engage in penis fencing.

2012

December 31: Ocular fundus aspect of retinoblastoma
December 30: spawning Pocillopora meandrina
December 29: A silvery mole rat.
December 28: Achelousaurus nasal openings
December 27: Example of a Scan for quantitative trait loci on a single chromosome
December 26: A Galápagos tortoise.
December 25: Fruiting bodies of the slime bacterium Myxococcus xanthus.
December 24: Electron microscopy of Prochlorococcus
December 23: Kent distribution of three point sets representing bond angle relations in a protein backbone.
December 22: The tiger beetle Omus dejeanii.
December 21: expression of FABP7 in mouse brains
December 20: Mycosphaerella graminicola chromosomes
December 19: Diplodocoidea cladogram
December 18: Drawing of Rhinopithecus strykeri
December 17: Rostral migratory stream of a mouse
December 16: Cataglyphis fortis experiencing head-wind on a slippery substrate
December 15: Clytus arietes
December 14:Atelopus franciscus male territorial call
December 13: The mushroom Boletopsis nothofagi.
December 12: Alec Jeffreys
December 11: The modern Emu (centre) and extinct King Island Emu (right) with human outline shown approximately to scale.
December 10: Blenniella gibbifrons jumping
December 9: Ebolavirus particles
December 8: Ankylosaurus tail terminology
December 7: Structural organization of the heart of the mosquito Anopheles gambiae
December 6: A Magicicada chorus.
December 5: Adélie Penguins.
December 4: Anodonthyla (frog) feet
December 3: The animal with the longest valid scientific name: the soldier fly Parastratiosphecomyia sphecomyioides.
December 2: Burrunan Dolphin jumping
December 1: Larvae of Culex mosquitoes.
November 30: A Magicicada cassini female laying its eggs.
November 29: A hydrophilic termite (Schedorhinotermes sp.) attached to the surface of a wetted citrus leaf
November 28: A range of putative disease-causing mechanisms for the case of the disease progeria
November 27: A large male Bolitotherus cornutus undergoing a grip strength trial.
November 26: A female Euglossa hyacinthina working on the construction of her nest envelope.
November 25: Reconstruction of a Nimbadon lavarackorum mother with a juvenile.
November 24: SEM image of the tardigrade Milnesium tardigradum in its active state.
November 23: The brown lacewing Micromus variegatus.
November 22: Carpodacus mexicanus (finch) vocalizations
November 21: The fish Alticus arnoldorum performing a jump (slow motion).
November 20: Larsenianthus arunachalensis, a member of the ginger family.
November 19: An Atlantic Yellow-nosed Albatross.
November 18: A Xenopus laevis female with egg batch and Xenopus tropicalis male.
November 17: Acoustic display of the hummingbird Archilochus alexandri.
November 16: Thyrinteina caterpillar parasitized by Glyptapanteles pupae defends against Supputius cincticeps
November 15: Anodonthyla theoi, dorsolateral and ventral views
November 14: A female Illacme plenipes with 662 legs.
November 13: Aerosteon riocoloradensis
November 12: maxilla from Fruitadens
November 11: The Garden centipede Scutigerella immaculata.
November 10: A female tarantula Acanthoscurria gomesiana.
November 9: drawing of female of Glomeris marginata
November 8: Centropyge bicolor feeding on Palaemonetes
November 7: Archerfish shooting at prey
November 6: The butterfly Erebia calcaria.
November 5: gastrulation in cybrid embryos
November 4: The sea slug Spurilla major.
November 3: Major metabolic interactions betwen astrocytes and neurons.
November 2: Venogram showing cerebral venous sinus thrombosis in a patient with Behçet's disease
November 1: MRI scans of a microcephalic patient (right) and a healthy control (left).
October 31: The Insular cortex (Japanese version).
October 30: The Neanderthal skull La Chapelle-aux-Saints 1.
October 29: A Varanus timorensis from Loré, Lautém District, East Timor.
October 28: Skeletal reconstruction (top) and inferred body outline (bottom) of the Cretaceous lizard Platecarpus.
October 27: map of European genetic structure based on single-nucleotide polymorphism analysis
October 26: Comparison of Nautilus capture rates with trapping depth
October 25: A male Labeotropheus fuelleborni from Lake Malawi.
October 24: Agdistis linnaei
October 23: Interneuron-radial glial interactions in the developing cerebral cortex.
October 22: drip irrigation on loamy soil
October 21: Lectotype of Elimia cahawbensis.
October 20: A Lamprolepis smaragdina skink.
October 19: Nylanderia pubens, the crazy Rasberry ant
October 18: Basal body of T3SS needle complex. The black line indicates 10 nanometers.
October 17: 3D reconstruction of the general anatomy of the small marine slug Pseudunela cornuta, based on histological sections.
October 16: map of where to find Amphicyclotulus in Dominica
October 15: comparison of furcula of (A) a dinosaur and (B) a goose
October 14: The wonder gecko Teratoscincus scincus.
October 13: A Morgan horse with silver rather than black pigments, due to the silver dapple gene.
October 12: booms by Cercopithecus hamlyni
October 11: Ipsa childreni, the charismatic cowrie
October 10: Combat between two forked fungus beetle (Bolitotherus cornutus) males.
October 9: A timelapse video of how muscles, skin, scales and quills are added to a skull cast of Heterodontosaurus tucki
October 8: Life restorations of Darwinius masillae
October 7: Melanargia arge.
October 6: Mary F. Lyon, discoverer of X-chromosome inactivation.
October 5: Drawing of the right valve external view of Pisidium moitessierianum
October 4: growth depictions for Archaeopteryx
October 3: MRI scan of an osteochondroma.
October 2: Inside krill one can see (A) pregnancy (B) phytoplankton
October 1: A Somali wild ass, Equus africanus somaliensis.
September 30: An Oncomelania hupensis hupensis snail.
September 29: A Taiwanophodes minor beetle. Scale: 1mm.
September 28: A Nerodia fasciata snake attacking a parvalbumin-coated lure.
September 27: Aphanius mesopotamicus
September 26: Diversity of ancestral rices
September 25: Maize cob from the Ocampo Caves in Mexico dated to 3,890 years ago.
September 24: Adult female and fetal Maiacetus.
September 22: A fiber-optic array for detection of breast cancer by way of Diffuse Optical Tomography.
September 21: Bradypodion atromontanum
September 20: Muscle biopsy from a girl with X-linked myotubular myopathy
September 19: Miamira magnifica
September 18: Carabus rumelicus
September 17: Gorilla tool use
September 16: New Jersey amber containing specimens of Plumalexius rasnitsyni
September 15: Buforaniidae grasshoppers from the Australian National Insect Collection.
September 14: Tiger phylogenetic relationships.
September 13: Vocalizations of the newly described monkey species Cercopithecus lomamiensis, known to science since yesterday.
September 12: The rotifer Brachionus calyciflorus
September 11: A Volucella bombylans hoverfly.
September 10: Haliclystus antarcticus in the field
September 9: A Conepatus semistriatus skunk.
September 8: Map of the Cahaba River and some of its tributaries.
September 7: Cross-section through the tail of Carnotaurus sastrei
September 6: Common anatomical types of esophageal atresia
September 5: Metarhizium anisopliae fungus, capable of killing more than 200 insect species including the pictured cockroach
September 4: The diversity and containment of coral reef systems make them good sites for testing niche and neutral theories in theoretical ecology
September 3: Genome data from the opossum Monodelphis domestica aids understanding of the evolution of the mammalian immune system.
September 2: Schematic illustration of differences in neuronal specification and migration patterns between the mammalian and avian pallium
September 1: Thuridilla carlsoni. Locality: Lizard Island, Great Barrier Reef. The length of the slug is about 2 cm.
August 31: The snake Lycodryas cococola from Comoros.
August 30: X-ray of the pelvis of a patient with osteopetrosis.
August 29: Larsenianthus careyanus.
August 28: Euhadra quaesita from Sendai
August 27: Gene silcencing in Genetically modified plants (here: Petunia).
August 26: Pit eye in Patella.
August 25: Spinophorosaurus nigerensis holotype skeleton in situ during excavation in the region of Aderbissinat, Niger
August 24: The type specimen of Brunfelsia plowmaniana.
August 23: ECG from a patient with confirmed Takotsubo cardiomyopathy
August 22:Daphnia magna, the water flea
August 21: Chalk composed of kaolinite with traces of quartz ingested (suckled) by a patient with pica. Scale in centimeters.
August 20: Schematic showing how ribozymes bind and cleave mRNA to prevent it from functioning.
August 19: Plant volatiles released by corn plants may help the caterpillar Mythimna separata avoid predators.
August 18: A female Trogloraptor marchingtoni spider, whose species, genus and family were named after citizen scientist Neil Marchington.
August 17: 5 different scintigrams taken from thyroids with different syndromes
August 16: United States-based population studies biologist, Paul R. Ehrlich
August 15: Zebras at the Maasai Mara National Park in Kenya.
August 14: A new species of green lacewing discovered in Malaysia through a citizen scientist, an online image database, and cybertaxonomy
August 13: Schematic diagram of how to decompose systems into overlapping complexes according to Tononi's Integrated Information Theory.
August 12: Mountainous landscape at Fenshuiling, Jinping County, Yunnan Province, China.
August 11: Lectotype of the snail Elimia ampla (MCZ 161735).
August 10: Scanning electron microscopic image of Ebola virions.
August 9: Map of the Messel pit.
August 8: Life restoration of Diamantinasaurus.
August 7: Ovotestis of Biomphalaria glabrata.
August 6: Deletion of the short arm of the chromosome 4 in a patient with Wolf-Hirschhorn syndrome.
August 5: Illustration of part of a liver lobule.
August 4: An African Black Oystercatcher, Haematopus moquini.
August 3: Coronal section containing the chronically imaged pyramidal neuron “dow” does not stain for GABA.
August 2: The mycobacteriophage Bxb1 uses a novel enzyme to remove itself from its bacterial host's genome before launching an infection.
August 1: Chloroplast ribosome.
July 31: Forest elephants in the Mbeli River, Nouabalé-Ndoki National Park, Congo.
July 30: A mangrove finch, the rarest of Darwin's finches.
July 29: A phylogeographic image of poison frogs' lineages from South America.
July 28: Electron micrograph showing exaggerated filopodia with club-like shape induced by formin mDia2 in cultured cells.
July 27: Over time, selective breeding modifies teosinte's few fruitcases (left) into modern corn's rows of exposed kernels (right).
July 26: Drusilla canaliculata, a rove beetle.
July 25: Lateral radiograph of the knee demonstrating ossification in the peritendinous tissues in a patient with osteochondroma.
July 24: Methylococcus capsulatus cultured in the presence of a high concentration of copper.
July 23: Schematic Representation of the Key Structural Features of SIV and HIV-1 Entry into T Cells.
July 22: Bruce Alberts, co-author of Molecular Biology of the Cell (textbook).
July 21: Biston betularia caterpillars on birch (left) and willow (right).
July 20: A territorial dispute between two male Astatotilapia burtoni.
July 19: Cast of the lower jaws of the crocodyliform Laganosuchus thaumastos. Scale bar equals 20 cm.
July 18: Selenops kalinago.
July 17: Reconstructed feeding posture of an azhdarchid with sagittally aligned limbs.
July 16: Ribbon diagram of human carbonyl reductase 1 in complex with NADPH.
July 15: Forest fruits from Barro Colorado Island.
July 14: Chocolate-backed kingfisher (Halcyon badia).
July 13: Biological specimen of substantia nigra in Parkinson's disease.
July 12: Prehistoric human migration from the Middle East to Neolithic Europe.
July 11: Harbor Branch Oceanographic Institution's submersible Johnson SeaLink.
July 10: Phylogenetic tree of life.
July 9: SEM image of trochophore of Haliotis asinina 9 hours post fertilisation.
July 8: Sloggett's Rat.
July 7: Artistic representation of Australovenator wintonensis.
July 6: Emergency military hospital during Spanish flu epidemic, Camp Funston, Kansas, United States.
July 5: The inner side of the operculum of Marstonia comalensis. Scale bar: 200 μm.
July 4: The Black crab Gecarcinus ruricola.
July 3: RNAi is a naturally occurring process in which small RNA molecules activate a cellular process that results in the destruction of a specific mRNA.
July 2: Cod in a high arctic lake in Canada. Due to overfishing and other changes Atlantic cod grow to half this size.
July 1: Heavy spotting on corn kernels reveals the activity of the Mutator system
June 30: Map showing Japanese archipelago, Sea of Japan and surrounding part of continental East Asia in Middle Pliocene to Late Pliocene.
June 29: Kidney biopsy (light microscopy) in which the purple stain is on the podocytes.
June 28: phenotypes of wild-type (top) and PAX6 ortholog mutations (bottom) in human, mouse, zebrafish, and fly.
June 27: Scanning electron micrographs showing morphological variation of bdelloid rotifers and their jaws.
June 26: This model of Phineas Gage's skull illustrates the approximate path of the tamping iron that produced his famous injury.
June 25: An African Black Oystercatcher chick with the numbered colour rings that are used to follow its survival and migratory movements over several years.
June 24: A female Selenops lindborgi spider with its egg sac.
June 23: Cross-Linked DNA Extracted from 4,000-Year-Old Liver of an Ancient Egyptian priest called Nekht-Ankh.
June 22: A T2-weighted sagittal MRI scan, from a patient with Arnold–Chiari malformation symptomatology, demonstrating tonsillar herniation.
June 21: Selection for social signalling drives the evolution of chameleon colour change.
June 20: This figure depicts one view of the history of human evolution based on fossil data.
June 19: Access2Research founders Heather Joseph, John Wilbanks, Michael W. Carroll and Mike Rossner after meeting at the White House Office of Science and Technology Policy.
June 18: In an effort to reduce corn stem-borer infestations, corporate and public researchers partner to develop local genetically modified maize varieties suitable for Kenya.
June 17: A fly falling into water and escaping.
June 16: Forest of synthetic pyramidal dendrites grown using Cajal's laws of neuronal branching.
June 15: Biologist Seymour Benzer with a model of Drosophila melanogaster.
June 14: An assassin bug Triatoma dimidiata, potential vector of Chagas disease.
June 13: Sampling sites of the Global Ocean Sampling Expedition.
June 12: A 12 million-year old upper jaw of the Sthenictis campestris, a member of the weasel family.
June 11: The Dorsal habitus of Oxypoda stanleyi, a rove beetle from Stanley Park. Scale bar: 1 mm.
June 10: A Cretaceous snake Sanajeh indicus feeding on hatchling sauropod dinosaurs.
June 9: A frog with chytridiomycosis.
June 8: Modified Gömöri trichrome stain showing several ragged red fibers in MELAS syndrome.
June 7: A Hemidactylus platyurus gecko displaying rapid inversion.
June 6: The butterfly Coenonympha oedippus.
June 5: Blue Whale calls in the presence of mid-frequency active sonar.
June 4: The freshwater gastropod Acochlidium fijiiensis.
June 3: The sea slug Aeolidiella stephanieae.
June 2: The Subventricular zone of a human brain.
June 1: Silhouette of Australovenator wintonensis showing the material of the holotype. Scale bar: probably 1m.
May 31: A female Selenops geraldinae Corronca eating a fly and guarding her egg sac on a bromeliad, Gaspar Grande Island, Trinidad and Tobago.
May 30: A metastasized Ewing's sarcoma.
May 29: Lateral X-ray image of a human knee, with fragmentation of the tibial tubercle.
May 28: The nomadic jellyfish Rhopilema nomadica.
May 27: The leaf miner Cameraria ohridella.
May 26: The tick Ixodes scapularis, a vector for Lyme disease.
May 25: A video on a petition for open-access mandates.
May 24: The fairyfly Myanmymar aresconoides in amber from Myanmar.
May 23: X-ray of a paratype of the smallest known vertebrate, the frog Paedophryne amauensis.
May 22: White matter connections illustrated with MRI tractography,.
May 21: A human brain as compared to that of a chimpanzee. Scale bar: 1 cm.
May 20: The scorpion Mesobuthus longichelus.
May 19: The freshwater snail Bulinus wrighti, an intermediate host of Schistosoma haematobium.
May 18: Transmission Electron Microscopy of the Synechococcus Phage S-PM2.
May 17: Patients waiting in a hospital in Apac. Many children here suffer from malaria.
May 16: A male Enyalioides rubrigularis lizard.
May 15: A Black howler monkey (Alouatta caraya).
May 14: ECG of a patient with Fabry's disease.
April 13: Life restoration of a Hippodraco dinosaur.
April 12: The agamid lizard Draco timorensis.
April 11: A coral reef community.
April 10: The sea slug Cyerce nigricans feeding on Chlorodesmis fastigiata.
April 9: Bone scintigraphy of a patient with colorectal cancer before and after chemotherapy.
April 8: Ice age fauna of what is today's Northern Spain.
April 7: The shell of the snail Opisthostoma goniostoma from Borneo.
April 6: The shorebird Calidris canutus.
April 5: The moth Catocala johnsoniana.
April 4: Evolutionary biologist Ernst Mayr.
May 3: The anthelmintic effect of papain on the nematode Heligmosomoides bakeri.
May 2: The Mlabri people in Thailand are hunter-gatherers whose ancestors practiced agriculture.
May 1: Capuchin monkeys sharing food.
April 30: The bird-of-paradise Paradisaea raggiana.
April 29: Reconstruction of Anatosuchus minor.
April 28: The chameleon Bradypodion damaranum.
April 27: CT scan of a craniopharyngioma.
April 26: Salmonella enterica ssp. enterica ser. Typhi murium.
April 25: Geographic distribution of emu taxa and historic shoreline reconstructions around Tasmania.
April 24: The shell Bulgarica denticulata.
April 23: The remipede Speleonectes tanumekes.
April 22: Melitaea cinxia.
April 21: Flabellina affinis feeding on Eudendrium racemosum.
April 20: The wasp Leptofoenus pittfieldae in Dominican amber.
April 19: Mating in the sea slug Elysia timida.
April 18: Computed tomography of a patient with Cherubism, showing bone malformation in both the mandible and the maxilla.
April 17: Life restoration of Aegisuchus witmeri.
April 16: The butterfly Coenonympha hero.
April 15: Map of localities from which Paedophryne frogs have been reported.
April 14: Congenital hereditary endothelial dystrophy.
April 13: Gene expression in Drosophila melanogaster. Scale bar: 100 μm.
April 12: Sociobiologist and entomologist Edward O. Wilson.
April 11: Forest on the island of Nosy Hara in Northern Madagascar.
April 10: Dilophosaurus wetherilli in a bird-like resting pose.
April 9: HE staining of chicken optic tectum with the layered subventricular zone. Scale bar 200 μm. .
April 8: The frog Paedophryne dekot, one of the smallest species of vertebrates.
April 7: Rhinophores in the slug Aplysia californica.
April 6: A Cape sugarbird (Promerops cafer).
April 5: Tissue necrosis following a bite from Bothrops asper.
April 4: Autoradiography of a saggital slice from an embryonal rat brain. Scale bar: 2mm.
April 3: A male Enyalioides rubrigularis lizard. .
April 2: The diatom Phaeodactylum tricornutum.
March 31: Head of the tentacled snake Erpeton tentaculatus under the scanning electron microscope.
March 30: Section through the olfactory bulb of a 16 days old rat brain.
March 29: A scanning electron micrograph of a single coccolithophore cell of Emiliania huxleyi.
March 28: Spodoptera exigua larva feeding on Nicotiana attenuata.
March 27: The single-celled ciliate Tetrahymena thermophila, whose genome was published in 2006. .
March 26: The butterfly Boloria improba in its natural environment.
March 25: X-ray of a girl's wrist, with enchondromas in the radius.
March 24: Aerial view of the Gobero archaeological site in Niger.
March 23: The pauropod Pauropus huxleyi.
March 22: A T. rex trotting along beside a T. rex-sized chicken. Not just biomechanically impossible.
March 21: The water flea Daphnia pulex.
March 20: Artistic representation of a diatom of the genus Navicula.
March 19: A clouded cornea in a patient with Fabry disease.
March 18: Range Expansion of Cro-Magnon into Europe from the Near East until about 32,500 years before present.
March 17: Forest on Barro Colorado Island in Lake Gatún, the heart of the Panama Canal.
March 16: MRI scans of patients lacking a corpus callosum.
March 15: E. coli fimbriae.
March 14: A male Asian house gecko Hemidactylus platyurus from East Timor.
March 13: A gorilla using a branch of a tree as a walking stick.
March 12: Map of the periglacial region in Japan at the height of the Last Glacial Maximum about 20,000 years ago.
March 11: A mouse fibroblast nucleus in which DNA is stained blue. The distinct chromosome territories of chromosome 2 (red) and chromosome 9 (green) are stained with fluorescent in situ hybridization.
March 10: The Golden Brain: the headquarters of the Russian Academy of Sciences.
March 9: A mucous cell bordering on the stomach lumen secretes mucus (pink stain).
March 8: A group of Macaca arctoides monkeys.
March 7: The viper Cerastes gasperettii with horns.
March 6: Forest in the Western Ghat, a biodiversity hotspot.
March 5: Albatrosses associating with a killer whale. Image taken by an albatros-borne camera.
March 4: MRI scan of a chordoma.
March 3: Yeast growing in chemostats.
March 2: Amelogenesis imperfecta.
March 1: Self-assembly of DNA into nanostructures.
February 29: Adult male Hapalomys delacouri rat.
Februrary 28: Fluorescence microscopy of wound healing in Drosophila.
February 27: A female Brookesia desperata with two freshly laid eggs.
February 26: Two-photon excitation microscopy of mouse intestine.
February 25: The fundus of a patient with retinitis pigmentosa.
February 24: The holotype adult skull of Pachycephalosaurus reinheimeri..
February 23: A painting of pyramidal neurons in the subiculum and CA1.
February 22: Coronal section of a human brain with cortical edema.
February 21: A love dart of the snail Monachoides vicinus.
February 20: A leaf-cutter ant.
February 19: Nuclei in the worm C. elegans.
February 18: The parasitic wasp Neoneurus vesculus ovipositing in workers of the ant Formica cunicularia.
February 17: The geodesic architecture of viral capsids. .
February 16: Song-learning pathways in birds..
February 15: A juvenile Brookesia micra standing on the head of a match.
February 14: A deep-sea community living nearby a hydrothermal vent. Has annotations.
February 13: Transgenic mice expressing enhanced green fluorescent protein.
February 12: Zebra finches.
February 11: A Golay cell.
February 10: Identical twins may look different.
February 9: Northwestern Yunnan, China.
February 8: Embryo and placenta.
February 7: The rove beetle Dalotia coriaria.
February 6: Pepper mild mottle virus in action.
February 5: The louse Fahrenholzia pinnata.
February 4: The small dinosaur Araripesuchus wegeneri.
February 3: Wolbachia inside a fruitfly cell.
February 2: Gough Island, one of the most remote places on Earth.
February 1: The blood-feeding sandfly Lutzomyia longipalpis, transmitter of Leishmaniasis
January 31: Francis Crick in his office.
January 30: The Eungella torrent frog Taudactylus eungellensis is critically endangered.
January 29: Gyps bengalensis, the oriental whitebacked vulture, is critically endangered.
January 28: Camarhynchus heliobates, the rarest of Darwin’s finches, is critically endangered.
January 27: Biomphalaria glabrata, intermediate host to the parasite Schistosoma mansoni that causes schistosomiasis..
January 26: Laetoli footprints and experimental approximation.
January 25: Biomass as seen by children.
January 24: Archaeological excavations in the Dhofar mountains in Oman.
January 23: Zebrafish embryos: wildtype on top, albino mutant below.
January 22: A tumor in the making.
January 21: How to measure odors?.
January 20: A sexually mature abalone Haliotis asinina.
January 19: Sari filtering in Matlab.
January 18: A PDF copy of en:Research Works Act for display during the SOPA blackout.
January 17: Toxoplasma gondii.
January 16: Skeletal reconstruction of Spinophorosaurus nigerensis..
January 15: A young male chimp.
January 14: Four different species of Volvocales algae.
January 13: A neuron grown in silico.
January 12: Paedophryne amauensis, the smallest known vertebrate.
January 11: Field work at Mt. Ruapehu in New Zealand.
January 10: An optical illusion. Stare at the figure for 10s and then switch gaze to the (F).
9 January: A lab notebook containing the record of research described in a scientific paper.
8 January: Koi pla - a traditional Thai dish.
7 January: A farm with traditional and hybrid varieties of Sorghum.
6 January: An adult female fly, Apocephalus borealis..
5 January: The sound of a black smoker.
4 January: The effect of a mutation in Auxin signaling on the growth of the model plant Arabidopsis thaliana.
3 January: A paper whose images are heavily used on Wikimedia projects.
2 January: A human liver fluke.
1 January: Afloat in kelp forests - the sea otter

2011

31 December: Salamanders are a model system for the study of limb regeneration.
30 December: Anatomy of the human ear – editable version.
29 December: Bradypodion taeniabronchum on the watch.
28 December: A lissencephalic human brain.
27 December: Tyrannosaurus with skin infection.
26 December: Leaf mines by Phyllocnistis hyperpersea larvae.
25 December: Chlorobalius leucoviridis mimicking the song of its prey.
24 December: The production and diffusion of nitric oxide (NO) (white) in the cytoplasm (green) of clusters of conifer cells one hour after mechanical agitation.
23 December: A male Oligoxystre diamantinensis.
22 December: Mimicry in Heliconius butterflies.
21 December: A sow with suckling pigs.
20 December: The chromosomes of a women.
19 Dec 2011: Rice terraces in the Philippines.
18 December: Baltimartyria rasnitsyni.
17 December: Pomacea canaliculata eggs.
16 December: Bee waggle dance.
15 December: Shimmering bees drive hornet away.
14 December: Northwest Crown Fire Experiments in Canada.
13 December: HIV on macrophage.
12 December: The sea slug Pleurobranchaea meckelii.
11 December: A bat in flight.
10 December: Samples in a seedbank.
9 December: Chalcolithic leather shoe from the Areni-1 cave.
8 December: Soft tissue reconstruction of the Longdan tiger.
7 December: Qualia of sound.
6 December: Burying behaviour of an adult sandfish (Scincus scincus).
5 December: Genetic subdivision in the giraffe based on mitochondrial DNA sequences.
4 December: Apertural view of the snail Rapana venosa.
3 December: Genome of Arthrobacter arilaitensis.
2 December: A Giant Haasts eagle attacking a New Zealand moa.
1 December: Actenoides concretus.

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