ADAPTATIONS 131 
the squirrel, has a similar armature of quills. The armadillo 
of the tropics has movable shields, and when it withdraws its 
Fic. 64.—Flying fishes. (The upper one a species of Cypselurus, the lower of Hxroce- 
tus.) These fishes escape from their enemies by leaping into the air and sailing 
or “flying” long distances. 
head (which is also defended by a bony shield) it is as well 
protected as a turtle. 
ee a 
Fic. 65.—The horned toad (PArynosoma blainvillet). The spiny covering repels many 
enemies. 
Special organs for defense of this nature are rare among 
birds, but numerous among reptiles. The turtles are all 
