Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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 most expensive cow in the world was sold in 2009 for $1.2 million.
-3
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
271
There's a competition in Sweden called Kaninhoppning, or rabbit show jumping.
-12
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14