. Beginners' Zoology . l^^^ Fig. 286.—Skeleton of Bird. Rh, vertebrae; Ci, clavicle; Co, coracoid; Sc, scap-ula; Si, sternum; H, humerus; R, radius; U,ulna; /j thumb; /V, femur; /?, tibia. See Fig. : Which is the stiffest portion of thevertebral column ? How are the ribs braced againsteach other ? Which is longer, thigh bone or shin .Compare shoulder blade with mans (Fig. 399). Whichis the extra shoulder bone ? Compare tail vertebraewith those of extinct bird. Fig. 290. Fig. 285.— Leg BonesOF Bird. middle has joints, and the outer toe has joints (Fig. 285).Is the thigh of a bird

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. Beginners' Zoology . l^^^ Fig. 286.—Skeleton of Bird. Rh, vertebrae; Ci, clavicle; Co, coracoid; Sc, scap-ula; Si, sternum; H, humerus; R, radius; U,ulna; /j thumb; /V, femur; /?, tibia. See Fig. : Which is the stiffest portion of thevertebral column ? How are the ribs braced againsteach other ? Which is longer, thigh bone or shin .Compare shoulder blade with mans (Fig. 399). Whichis the extra shoulder bone ? Compare tail vertebraewith those of extinct bird. Fig. 290. Fig. 285.— Leg BonesOF Bird. middle has joints, and the outer toe has joints (Fig. 285).Is the thigh of a bird bare The shin } Theankle ? Where is the anklejoint of a bird } Doyou see the remainsof another bone (thesplint bone, or fibula)on the shin bone ofthe (Fig- 285or 286.) Why wouldseveral joints in theankle be a disadvan-tage to a bird . BIRDS 153 The tJiigh hardly projects beyond the skin of the trunk,as may be noticed in a plucked fowl. The thigh extendsforward from the hip joint (Figs. 286,

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