Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Condoms were originally made of animal intestines or linen.
347
The reindeer is the only mammal that can see UV light.
17
Rattlesnake mating sessions have been known to last more than 22 hours.
232
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
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