This mod Also called More Nature Mod. Animals Plus is a mod that adds new creatures to the game, some ofthem are terrestrial and maritime. The new creatures you’ll find in your Minecraftworlds are: snakes, birds of various colors, whales, centipedes, grasshoppers, butterflies,stripes or blankets, rats and lizards.
More Nature (Animals+) Mod, like its name says, brings some unique creatures to your world. Downloading this mod means you can see huge whales huge whales majestically swimming in the vast oceans. Snakes are in lurking in every dark corner in the overgrown forests. Meanwhile, in the graceful plains there are crickets scurrying at your feet and butterflies dancing around you.?
Go to More Nature Mod wiki page to see more information
Visit the original mod thread here for all info.