A tree frog is any frog that spends a major portion of its lifespan in trees, known as an arboreal state. Two 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, resulting in almost identical habitats and ecologies between the two families, have resulted in species that strongly resemble one another. In fact, they are so similar as regards their ecological niche that where one group occurs, the other is almost always absent. Their present-day distribution indicates that the last common ancestor of the two tree frog groups lived long before the extinction of the dinosaurs.

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