jTROGS and toads 
129 
The common spade-foot, found in Northern, 
Eastern and Central Europe, is peculiar in 
the fact that it exudes a very strong 
odour that smells like garlic, and for this 
reason it is often spoken of as the garlic 
frog. 
A very interesting group are the tree-frogs, 
of which there are more than two hundred 
species. The common or European green 
tree-frog is one of the best known, and is 
frequently kept as a pet. The male, which 
may be distinguished from the female by the 
brownish tint of its throat, whereas that of 
the latter is white, has an exceedingly powerful 
voice, and when engaged in his vocal perfor¬ 
mance he blows out his throat like that of a 
pouter pigeon. 
Notwithstanding that tree-frogs are excellent 
jumpers, they seldom avail themselves of their 
powers in this respect for evading their enemies, 
but usually rely upon their protective colouring 
to avoid detection. Some of them, however, 
are very brightly and conspicuously coloured, 
one kind found in Central America being sky- 
blue upon its back and rose coloured upon the 
under surface of its body; while another 
species from North America, known as the 
goose-footed tree-frog, is decorated with irregular 
cross-bars of red and fawn hues. 
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