Cows can sleep standing up, but they can only dream lying down.
745
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Jellyfish as a species are actually older than dinosaurs and sharks.
383
Condoms were originally made of animal intestines or linen.
347
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