ADAPTATIONS 



297 



the squirrel, has a similar armature of quills. The armadillo 

 of the tropics has movable shields, and when it withdraws its 



U.-H. 



FIG. 165. Flying fishes. (The upper one a species of Cyp&elurus, the lower of Exocce- 

 tus.) These fishes escape from their enemies by leaping into the air and sailing 

 or "flying 1 ' long distances. 



head (which is also defended by a bony shield) it is as well 

 protected as a turtle. 



K^ 



FIG. 1G6. The horned toad (Phrynowma blainmllei). 



enemies. 



The spiny covering repels many 



Special organs for defense of this nature are rare among 

 birds, but numerous among reptiles. The turtles are all 

 20 



