194 



ANIMAL BIOLOGY 



1 Cold-blooded animals are those animals in which the tempera- 

 ture of the blood changes with the temperature of their surround- 

 ings. Warm-blooded animals, on the other hand, maintain under 

 normal conditions an almost constant temperature. The tempera- 

 ture of the human body, for example, is 98.6 F., which is usually 

 higher than the temperature of the earth, air, and water; con- 

 sequently when we touch a fish or frog, the animal feels cold. 



