response: I don't know about the light details for animals but they many are green because they adapted to their green environments. Their green hues then become a camouflage for them.
original_response: Many creatures have learned to change their green to their environments by adopting green hues themselves and camouflage.
history: This is interesting as my favorite color really is green! I see, examining the visible spectrum, green would be found between yellow and blue. Yes, it is. I like all shades of green, but lean towards a green apple green. Neat, did you also know its evoked from dominant wavelengths of light that are approximately 495570 nm? Well, that is a lot of technical info I'm unsure about so I guess no? LOL. Also is light being emitted by the animals that are green?
knowledge: Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage.