In common with other frogs and toads, the Los Bracitos tree frog is a carnivore, feeding largely on insects (3). A sit-and-wait predator, it detects its prey with acute eyesight, capturing its target on the sticky upper surface of its long paddle-like tongue. In contrast, the free-swimming tadpoles have a vegetarian diet, using fleshy lips and horny teeth to rasp at algae and aquatic plants (4).
Males attract females using raucous, mechanical-like calls, advertising themselves from conspicuous positions on prominent rocks or vegetation (2). Mating takes place in shallow water, and the male clasps the female behind the front limbs, initiating fertilisation, and the resulting fertilised eggs are laid in the wall of a moist streamside cave (2) (3). It is possible that the Los Bracitos tree frog breeds in the same pond each year, using environmental cues, such as smell and humidity, to locate the breeding grounds. As is typical of the humid tropics, breeding is not dependant upon seasonal fluctuations in rainfall and temperature, and pairs may mate at any time of the year (4).
The skin of the Los Bracitos tree frog is very thin and permeable, with a rich supply of blood vessels that allow the frog to absorb water through its skin whilst submerged. As a result, it has little control over water loss from its body, and so during periods of drought or high temperature, the Los Bracitos tree frog will alter its body posture to expose more or less of its body surface to the prevailing conditions (4).