. Beginners' Zoology . Fig. 338. — Claw of Cat(i) retracted by ligament, and(2) drawn down by muscleattached to lower tendon. 190 BEGINNERS ZOOLOGY shown when the cow was classified (p. 9). Their care forthe young, their intelHgence, and their ability to survivewhen in competition with other animals, causes the mam-mals to be considered the highest class in the animalkingdom. According to these tests, what class of vertebrates shouldrcuik next to mammals? Compare the heart, the lungs,the blood, and the parental devotion,of these two highestclasses of ai]imals. ^Kr-^A«^^^rvf^ -Vxi)^^. f Fig. 33
. Beginners' Zoology . Fig. 338. — Claw of Cat(i) retracted by ligament, and(2) drawn down by muscleattached to lower tendon. 190 BEGINNERS ZOOLOGY shown when the cow was classified (p. 9). Their care forthe young, their intelHgence, and their ability to survivewhen in competition with other animals, causes the mam-mals to be considered the highest class in the animalkingdom. According to these tests, what class of vertebrates shouldrcuik next to mammals? Compare the heart, the lungs,the blood, and the parental devotion,of these two highestclasses of ai]imals. ^Kr-^A«^^^rvf^ -Vxi)^^. f Fig. 339. —SkELETON of Lion (cat family). W-V The first mammals, which were somewhat like smallopossums, appeared millions of years ago, when the worldwas inhabited by giant reptiles. These reptiles occupiedthe water, the land, and the air, and their great strengthand ferocity would have prevented the mammals frommultiplying (for at first they were small and weak), butthe mammals carried their young in a pouch until able tocare for themselves, while the reptiles laid eggs and leftthem uncared for. The first mammals used reptilian eggsfor food, though they could not contend with the greatreptiles. Because birds and mammals are better parentsthan reptiles, they have conquered the earthy and the rep- MAMMALS 191
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