186 



FIRST LESSONS IN ZOOLOGY. 



stand a long fast ; they will in captivity eat insects and take 

 milk. 



The chameleons have the five toes arranged in two op- 

 posable groups adapted for grasping the twigs of trees; 



FIG. 191. Horned Toad. 



their eyes have a movable circular lid ; they have remark- 

 ably long tongues (Fig. 192), which can be darted out five 

 or six inches at insects, which adhere to the sticky swollen 

 extremity while the body of the chameleon is perfectly im- 

 movable. Chameleons can change their color at will ; as 



FIG. 192. Tongue of Chameleon. (Natural size.) 



can the Anolis (Fig. 193) of Florida, which is a long smooth- 

 bodied lizard, having the power of changing its color from 

 a bright pea-green to a deep bronze-brown. 



We have seen that among amphibians the blind snake 

 is entirely limbless, and so among lizards there are several 

 limbless forms, among them the glass-snake (Ophisaurus) 



