Red eyed tree frog

Red eyed tree frog, a photo by sachinvijayan on Flickr.

Via Flickr:
Being green helps the red-eyed tree frog blend in with tree leaves. This keeps it hidden from both the insects it eats and the predators that want to eat it. Red-eyed tree frogs are nocturnal, or active at night. During the day they rest. When one of these tree frogs sits still on a green leaf, legs tucked in and eyes shut, it is practically invisible.