image credit (1) Killer whales are not whales at all, rather a species of dolphin. (2) About two-thirds of shark attacks on humans have taken place in water less than six feet deep. (3) Butterflies can only see the colours red, green and yellow. (4) A duck's quack does echo, it’s just almost impossible to hear. duck image credit (5) Millions of trees are accidentally planted by squirrels that bury nuts and then forget where they hid them. (6) The slowest fish is the sea horse, which moves along at about 0.01 mph (0.016 km/h). (7) It seems that the skin of elephants are hairless. But, actually elephants are covered with very thin hair. squirrel sea horse image credit (8) Dumbledore isn’t only the Headmaster of Hogwarts; in fact a dumbledore is an old English term for a type of bee. (9) Butterflies have their skeletons on the outside of their bodies, this is known as the exoskeleton. (10) The Big Five is a group of animals of Africa: cape buffalo, e