. Essentials de biologie a présenté des problèmes. La biologie. 310 L'animer des vertébrés autres exemples familiers sont les dindes, cailles, perdrix ou gélinottes huppées et les faisans et poules des Prairies. Dans ce groupe les jambes sont solides et stout, le corps trapu, la loi et les griffes plutôt émoussé. Les oiseaux de cet ordre ne volent pas loin dans un état de nature, préférant vivre sur ou près du sol. Ces oiseaux comme la gélinotte huppée, qui nichent sur le sol, sont presque toujours de façon protectrice de couleur. Un autre exemple intéressant de ressemblance de protection dans ce groupe est vu dans le lagopède. Ce bi

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. Essentials of biology presented in problems. Biology. 310 THE VERTEBRATE ANIMATE Other familiar examples are the turkeys, quails, partridge or ruffed grouse, and the pheasants and prairie chickens. In this group the legs are strong and stout, the body thickset, the bill and claws rather blunt. Birds of this order do not fly far in a state of nature, preferring to live on or near the ground. Such birds as the ruffed grouse, which nest on the ground, are almost invariably protectively colored. Another interesting example of protective resemblance in this group is seen in the ptarmigan. This bird in the winter is white as the snow which surrounds it; in the spring it molts, turning to a gray and white, thus resembling the lichens among which it feeds. III. Birds of Prey. — These birds are characterized by the strong hooked beak, adapted to tearing, and by the sharp claws, which are curved and strong. IMembers of this group that are best known to us are the hawks, the condor, with its great sweep of ten feet from wing to wing, and the eagle. IV. Waders. — These are birds with unusually long legs and long necks, the latter character being a natural correlation of greatest service in food getting. Examples are the mud hen or coot, the snipe, crane, heron, and stork. The last two are the giants of the group. The Swimmers and Divers. — Birds placed in these orders have the feet webbed ; the wings are often adapted for long and swift flight. In this division are placed the guUs, terns, ducks, geese, loons, auks, and pufBns. Other Orders. — Other orders of birds include the doves, the only remaining native representative being the mourning dove; the wood- peckers, strong and long of bill, the friend of the lumberman as a savior of the trees from boring pests which live under the bark; the swifts and humming birds, the latter among the tiniest of all vertebrate animals; and the parrots, of which we have only one native form, the Carolina paroquet {Conurus carolinensi

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• bookcentury1900
• bookdecade1910
• booksubjectbiology
• bookyear1911