Denmark has twice as many pigs as there are people.
66
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The world’s largest frog, the Goliath frog, can grow over 13 inches in length and can jump up to 10 feet in a single bound.
8