The Lemur Leaf Frog (Agalychnis lemur) is a Critically Endangered amphibian found in the rain forests of Central America. The largest known breeding population is in Costa Rica.

The Lemur Leaf Frog is a relatively small frog, only growing to a length of about 1-2 inches. It typically has a bright green back with black speckles, a yellow underbelly, and yellow toes. The toes and legs are both relatively long, without any form of webbing. Unlike some other brightly colored frogs, it does not have any sort of toxic secretion to defend itself.

Male frogs are very territorial. They emit a short, rapid “ticking” sound to warn other nearby males. When a male is challenged by another frog or encounters an unreceptive female, they will often clasp the intruder and attempt to push them off of their perch.

The frog is nocturnal and typically is found hanging on the underside of a leaf, near the water, in daylight. After night falls, the Lemur Leaf Frog will change its color to a dark brown in order to camouflage. This gives the frog an advantage when hunting its food, which includes insects and other small invertebrates.