File:Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals (1907) (14773386105).jpg

Identifier: evolutionanimall00jord (find matches)
Title: Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals
Year: 1907 (1900s)
Authors: Jordan, David Starr, 1851-1931 Kellogg, Vernon L. (Vernon Lyman), 1867-1937
Subjects: Evolution
Publisher: New York, D. Appleton and Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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FIG. 270.—Nestlings of American bittern. Four birds, of which two are shown in Fig.269, two weeks old, at which age they showed marked fear of man. (Photographby E. N. Tabor, Meridian, N. Y., June 8, 1898. Permission of Macmillan Co.,publishers of Bird Lore.) the seasons. When the winter comes the fur seal takes itslong swim to the southward; the wild geese range themselvesin wedge-shaped flocks and fly high and far, calling loudly asthey go; the bobolinks straggle away one at a time, flyingmostly in the night, and most of the smaller birds in coldcountries move away toward the tropics. All these movementsspring from the migratory instinct. Another climatic instinctleads the bear to hide in a cave or hollow tree, where he sleeps REFLEXES, INSTINCT, AND REASON or hibernates till spring. In some cases the climatic instinctmerges in the homing instinct and the instinct of reproduction.When the birds move north in the spring they sing, mate,
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(C O> c 03 bC _G 15a a cc I 03 o and build their nests. The fur seal goes home to rear its young.The bear exchanges its bed for its lair, and its first businessafter waking is to make ready to rear its young.29 43cS EVOLUTION AND ANIMAL LIFE Environmental instincts concern the creatures mode of life.Such are the burrowing instincts of certain rodents, the wood-chucks, gophers, and the like. To enumerate the chief phasesof such instincts would be difficult, for as all the animals arerelated to their environment, this relation must show itself incharacteristic instincts. The instincts of courtship relate chiefly to the male, the femalebeing more or less passive. Among the birds the male in spring is in very many speciesprovided with anornamental plumagewhich he sheds wrhenthe breeding seasonis over. The scarlet,crimson, orange, blue,black, and lustrouscolors of birds arecommonly seen onlyon the males in thebreeding season, theyoung males andthe old males in thefall having the plainbr

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