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
Sharks have been on the planet longer than trees.
14
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
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
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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