A freaking PENGUIN... it walks around in the snowy biome and if you can add special swimming features and stuff. Also add fish for the penguin to hunt/kill like a wild wold kills a pig. make the penguin tameable. and also make the penguin so if you have two tamed one's they make a baby egg which stays on one of their textures for like a minecraft day the hatches a baby penguin. If u do that u will show all modders who's Boss