Lion\nIn order to become the leader of the pack, lions must win a duel.\n\nIn order to become the leader of the pack, lions must win a duel. The larger their mane, the more respect they are shown by their rival. But not only does it look breath-taking – it also protects the animals from serious injuries on their heads and necks.\n\nFun fact\nThe lion's mane begins growing at one year of age.