What is Tree frog?
[[File:Laubfrosch cropped.jpg|right|thumb|A European tree frog]] [[File:Ecnomiohyla rabborum.jpg|thumb| ''Ecnomiohyla rabborum'', Rabbs' fringe-limbed treefrog. Only one living specimen is known to exist.<ref>{{cite news|date=2012-02-17|title=Rare frog dies, one of only two left in the world|publisher=WKYT News|url=http://www.wkyt.com/news/headlines/Rare_frog_dies_one_of_only_two_left_in_the_world_139530898.html?ref=898|url-status=dead|archive-url=https://web.archive.org/web/20131004223451/http://www.wkyt.com/news/headlines/Rare_frog_dies_one_of_only_two_left_in_the_world_139530898.html?ref=898|archive-date=2013-10-04|accessdate=2012-02-17}}</ref>]] [[File:Vermicamaennlateral.jpg|right|thumb|Big-eyed tree frog, ''Leptopelis vermiculatus'']] '''Tree frogs''' are [[frog]]s that spend most of their life in [[tree]]s. There are several [[Lineage (evolution)|lines]] of [[Neobatrachia]] which have evolved into tree frogs. These groups are only distantly related, but they have evolved for a long time in similar conditions. The result is that now there are species from different groups which look very much like each other. This is [[convergent evolution]]. It goes so far that in almost all cases, where one group occurs, another does not. Their current distribution shows that the last common ancestor of the groups lived before the [[dinosaur]]s [[K/T extinction event|disappeared]]. The frogs do not normally come down to the ground, except to mate and spawn. Some build foam nests on leaves and rarely leave the trees as adults. In some species the eggs develop directly into adults; in others the tadpole stage is spent in the water pool of a large tropical tree leaf. Many tree frogs can change their colour for better [[camouflage]]. Others are poisonous ([[poison dart frog]]), and display [[warning colouration]]. Tree frogs are usually tiny, as their weight has to be carried by the branches and twigs of their [[habitat]]. While some reach 10 cm (4 in) or more, they are typically smaller and more slender than terrestr