Another species of Agalychnis is A. saltator, which lives in the same swamps as A. callidryas in Costa Rica. This species has plain blue sides instead of the yellow and blue pattern of A. callidryas. The colors of this species can change in just 30 seconds, depending on its mood and time of day. The frog below is sleeping, with eyes retracted into its head. The next picture shows him waking. Both pictures show the lime green colors of a disturbed frog at night.

In the next picture the same species is sleeping at night and showing a completely different color. This brown and green striped pattern could only be photographed when the frog was completely undisturbed at night....even a flashlight beam was enough to startle him into the lime green color shown above. I had to use an extra-dim flashlight and a lot of stealth and speed to catch him in the striped pattern. In the first shot below, he is sleeping with eyes retracted. He wakes up in the next picture, and then starts walking around.