Corals attack each other with stinging cells in order to gain more territory. Crocodile tracks have been found in the middle of the Sahara Desert. No two zebras have the exact same pattern of stripes. Sloths actually let algae grow on their hides so they can camouflage themselves better. Giant-sized clams, worms and crabs live underwater near volcanic areas.
Swifts spend most of their lives in the air and only land to breed.
Prehistoric Dragonflies had wingspans of just over a metre across. Blue whale babies weigh up to 7 tons at birth.