File:Callorhinus ursinus (northern fur seal) skull 4 (32712141147).jpg
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[edit]DescriptionCallorhinus ursinus (northern fur seal) skull 4 (32712141147).jpg |
Callorhinus ursinus (Linnaeus, 1758) - northern fur seal skull (anterior view). (Ohio State University Museum of Zoology) Mammals are the dominant group of terrestrial vertebrates on Earth today. The group is defined based on a combination of features: endothermic (= warm-blooded), air-breathing, body hair, mother's milk, four-chambered heart, large brain-to-body mass ratio, two teeth generations, differentiated dentition, and a single lower jawbone. Almost all modern mammals have live birth - exceptions are the duck-billed platypus and the echidna, both of which lay eggs. Mammals first appear in the Triassic fossil record - they evolved from the therapsids (mammal-like reptiles). Mammals were mostly small and a minor component of terrestrial ecosystems during the Mesozoic. After the Cretaceous-Tertiary mass extinction at 65 million years ago, the mammals underwent a significant adaptive radiation - most modern mammal groups first appeared during this radiation in the early Cenozoic (Paleocene and Eocene). Three groups of mammals exist in the Holocene - placentals, marsupials, and monotremes. Other groups, now extinct, were present during the Mesozoic. Northern fur seals are native to the western coasts of America and Canada, the coasts of Alaska, the Aleutian Islands, and the eastern coasts of northeastern Asia. Classification: Animalia, Chordata, Vertebrata, Mammalia, Carnivora, Pinnipedia, Otariidae See info. at: <a href="https://en.wikipedia.org/wiki/Northern_fur_seal" rel="noreferrer nofollow">en.wikipedia.org/wiki/Northern_fur_seal</a> |
Date | |
Source | Callorhinus ursinus (northern fur seal) skull 4 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32712141147 (archive). It was reviewed on 10 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 December 2019
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current | 01:47, 10 December 2019 | ![]() | 2,361 × 2,640 (2.95 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 07:49, 3 April 2019 |
Lens focal length | 8.295 mm |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
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Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 20:01, 20 April 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 07:49, 3 April 2019 |
Meaning of each component |
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APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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File source | Digital still camera |
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Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 16:01, 20 April 2019 |
Unique ID of original document | D8E6929BD8B0BC2C112DF9C2320610B4 |