With a height of 5.5m, the giraffe is the tallest animal in the world. Their numbers in Africa have plummeted by a staggering 40% over the last 30 years. With their very long necks, Giraffes are able to feed on the foliage of trees that is inaccessible to other herbivores. If you take too many photos, they might flash you their tongue: its black and up to 53cm long.