A tree frog is any frog that spends a major portion of its lifespan in trees, known as an arboreal state. Several lineages of frogs among the Neobatrachia have given rise to tree frogs, even though they are not closely related to each other.
Many millions of years of convergent evolution have resulted in almost identical morphology and ecologies. In fact, they are so similar as regards their ecological niche that in one biome where one group of tree frogs occurs, the other is almost always absent. The last common ancestor of some such tree frog groups lived long before the extinction of the dinosaurs.
As the name implies, these frogs are typically found in trees or other high-growing vegetation. They do not normally descend to the ground, except to mate and spawn, though some build foam nests on leaves and rarely leave the trees at all as adults.
Tree frogs are usually tiny, as their weight has to be carried by the branches and twigs in their habitats. While some reach 10 cm (4 in) or more, they are typically smaller and more slender than terrestrial frogs. Tree frogs typically have well-developed discs at the finger and toe tips; the fingers and toes themselves, as well as the limbs, tend to be rather small , resulting in a superior grasping ability. The genus Chiromantis of the Rhacophoridae is most extreme in this respect: it can oppose two fingers to the other two, resulting in a vise-like grip.
Tree frogs are members of these families or genera:
- Hylidae, or "true" tree frogs, occur in the temperate to tropical parts of Eurasia north of the Himalayas, Australia and the Americas.
- Rhacophoridae, or shrub frogs, are the tree frogs of tropical regions around the Indian Ocean: Africa, South Asia and Southeast Asia east to Lydekker's line. A few also occur in East Asia.
- Centrolenidae, or glass frogs, are potentially closely related to hylids; these translucent frogs are native to Central and South America.
- Hyperoliidae, or reed frogs, are closely related to the burrowing Microhylidae; these small frogs are native to sub-Saharan Africa.
- Boophis is a genus of highly arboreal frogs which evolved from the toxic terrestrial Mantellidae of Madagascar.
- Pedostibes, or tree toad, is a genus of highly arboreal members of the typically terrestrial Bufonidae.
Common tree frog, Polypedates leucomystax, Rhacophoridae, southern to eastern Asia
Powdered glass frog, Cochranella pulverata, Centrolenidae, Honduras to Ecuador
Big-eyed tree frog, Leptopelis vermiculatus, Hyperoliidae, Tanzania
White-lipped bright-eyed frog, Boophis albilabris, Mantellidae, Madagascar
Malabar tree toad, Pedostibes tuberculosus, Hyperoliidae, India
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