Cats sleep for 70% of their lives.
8
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
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
A cow produces around 200,000 glasses of milk in her lifetime.
373
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492