Jellyfish as a species are actually older than dinosaurs and sharks.
383
The cat brain weighs about 30g.
167
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 difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20