Too much variation in specificity. In my opinion, you should stick with the basic forms, otherwise you've got yourself a handful of "Red ____" animals you could potentially include). Rhinoceros, roadrunner, reindeer, raven, rabbit, raccoon, rat, robin, ray, etc. would be good. Possibly rooster and rottweiler if you're aiming to make this game more kid friendly, rather than scientific. Rattlesnake might be okay--most people have heard of it, even though it's a fairly specific form of snake.
I would say the more kid friendly you want it, the less you should use specific names like "red ____". |