Publisher's Synopsis
Excerpt from An Introduction to Zoology, Vol. 2 of 2
In consequence of their small amount of respira tion, Reptiles are cold-blooded; that is, their blood is scarcely warmer than the temperature of the at mosphere at any given time. They, therefore, do not need such a covering as hair, wool, or feathers, to retain animal heat; and for defence a naked skin is sufficient, which in some is hardened into horny plates, or scales.
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