Valiant is the titular protagonist of Disney's 2005 animated film of the same name. He is a short patriotic pigeon who wanted to join the Royal Homing Pigeon Service. He was teased for thinking that he could do so. It turned out that it was his size that enabled him to accomplish a great deed.
For his actions during the war (he managed to sneak down the gun barrel and retrieve the plans), he gets accepted in the Royal Homing Pigeon, and Nurse Victoria becomes his girlfriend.