Red-eyed tree frog (red-eyed leaf frog) (Agalychnis callidryas) on a branch, Costa Rica

agalychnis callidryas rainforest amphibian green branch colors tropical species wildlife biodiversity costa rica frog habitat nocturnal nature ecology animal adaptations conservation color red eyes ecosystem anatomy exotic behavior inhabitants fauna amphibious life observing colorful environment zoology diversity protection natural characteristics preservation living organisms ecological systems variety beauty