Well, one example would be a hare. In winter, they change by growing a big, fur coat to keep them warm.
Another great example would be ducks and/or chickens. When winter is approaching, they shed their old feathers (also known as "molting") and grow a new, thicker layer of feathers to keep warm. I know this from experience, because I have 2 ducks and some chickens of my own. =) Hope this helps! ^_^
Well there is a type of rabbit that will change to snow white when it is cold out side to blend in. I don't know much of anything else but I hope that'll help. Good luck! Have a great day!
