. Beginners' Zoology . 1/6 BEGINNERS ZOOLOGY shape to enable the body to penetrate the air, and a smallneck would destroy the conical form. The internal organsare compactly arranged and rest in the cavity of the breast-bone. The bellows-like air sacs filled with warm airlighten the birds weight. The bones are hollow and verythin. The large tail quills are used by the bird only inguiding its flight up and down, or balancing on a limb. The feet also aid aflying bird m bal-ancing. The wingis so constructed asto present to theair a remarkablylarge surface com-pared with thesmall bony supportin the
. Beginners' Zoology . 1/6 BEGINNERS ZOOLOGY shape to enable the body to penetrate the air, and a smallneck would destroy the conical form. The internal organsare compactly arranged and rest in the cavity of the breast-bone. The bellows-like air sacs filled with warm airlighten the birds weight. The bones are hollow and verythin. The large tail quills are used by the bird only inguiding its flight up and down, or balancing on a limb. The feet also aid aflying bird m bal-ancing. The wingis so constructed asto present to theair a remarkablylarge surface com-pared with thesmall bony supportin the wing skele-ton. Are tubesever resorted to byhuman architects when lightness combined with strengthis desired .-* Which quills in the wing serve to lengthenit? (Fig. 296.) To broaden Is flight more difficultfor a bird or for a butterfly? Which of them do the flyingmachines more closely resemble? Can any bird fly for along time without flapping its wings ?. Fig. 322.— Herring Gull. (Order?) Exercise in the Use of the Key. — Copy this list and write the nameof the order to which each of the birds belongs. (Key, page 177.) Cockatoo (Fig. 320) Wren (Fig. 310) Pheasant (Fig. 319) Sacred Ibis (Fig. 328) Apteryx (Fig. 318) Wood Duck (Fig. 314) Screech Owl (Fig. 311) Lyre bird (Fig. 327) Jacana (Fig. 324)Nightingale (Fig. 325) Road Runner (Fig. 313) Sea Gull (Fig. 322)Top-knot Quail (Fig. Ostrich (Fig. 332) Heron (Fig. 315) 329) Penguin (Fig. 330) Hawk (Fig. 312) BIRDS 177 KEY, OR TABLE, FOR CLASSIFYINGINTO ORDERS Aj Wings not suited for flight, 2 or 3 toes Ag Wings suited for flight (except the penguin) Bj Toes united by a ivebfor swininiing, legs short Cj Feet placed far back ; wings short, tip not reaching to base of tail (Fig. 300) Bill flattened, horny plates under margin of upper bill (Fig. 323)Cg Wings long and pointed, bill slenderC4 All four toes webbed, bare sac underthroatBj Toes not united by iveb for sivininiing BIRDS {Class
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