Navy's mascot is a goat, otherwise known as "Bill The Goat." Why? Well, according to Navy's official website, goats were a common companion on ships, because they could constantly provide milk ...

In 1893, a goat named El Cid, made his debut at the Army-Navy game. Navy won and he was adopted as the mascot. In the early 1900s, he was given the name Bill in reference to a commander's pet goat.