LIZARDS AND CROCODILES AT THE ZOO 269 
other frogs, and the young of ground-birds, ducks or 
chickens are likely to wander. Half covered with 
dry earth, the frog resembles a patch of greenish wet 
moss on wet mud. The chicken or rat which ap- 
proaches this is immediately seized by an enormous 
mouth, which opens and shuts with a snap like the 
back of a watch. Like other selfish and greedy 
people, this frog is extremely short-tempered and 
resentful when its own comfort is interfered with : 
and when poked, and otherwise teased, swells its body 
out to nearly double its original size, and slowly hops 
with gasps and growls after its tormentor in a 
paroxysm of rage and excitement. 
