CHAPTER XI. 
TREE-FROGS. 
HE family of the Hylide is rather a large one, numbering 
A about ten genera, and something like 170 species. The 
structure of their skeleton shows that these beautiful Frogs 
are closely related to the Toads, but are chiefly distinguished from 
them by the possession of teeth in their upper jaws. 
Tree-frogs are very plentiful in Australia and America. They 
are also found in more or less abundance in Europe, Asia, chiefly 
north of the Himalayas, and in the northern parts of Africa. 
Many of them are very beautiful and wonderfully active. 
The cases in which Tree-frogs are confined should be provided 
with some kind of growing plants, such as orange and lemon 
trees, geraniums, broad-fronded ferns, tradescantia, and the like. 
The larger the Vivarium is, of course, the better. There should 
also be within it hiding-places for its inmates, e.g., pieces of cork, 
bark, or small hollow logs. The water may be contained in a 
large shallow clay saucer, or in a zinc tank made for the purpose. 
Tree-frogs will live in a small case about a foot square, but 
naturally they are far happier in one of greater dimensions. 
Several different kinds of Tree-frogs may be kept in the same 
large Vivarium, where their beauty and activity will be seen to 
great advantage. Sometimes Tree-frogs, such as the common 
. Green Tree-frog (ZZyla arborea), are confined in a wide-mouthed 
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