The cat brain weighs about 30g.
167
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
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
Dolphins have names for one another.
18
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268