The elephant brain weighs about 6,000g.
274
A dairy cow can produce more milk when listening to music.
446
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Dolphins have names for one another.
18
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20