Evolution 



range between 80 and 93 degrees Fahrenheit, whereas all other 

 mammals, so far as is known, have a blood temperature between 



FiG. 106. New Guinea Spiny Ant-eater. 



97 and 105, and moreover one that is remarkably constant for 

 each species during normal health. The brain development and 



FIG. 107. Australian Spiny Ant-eater. 



the intelligence are also much lower than in other mammals, 

 though distinctly superior to those met with among the reptiles. 



128 



