Millions of years ago the ancestors of modern elephants instead of the trunk had elongated fused nose and upper lip. Their elephant broke from the trees, eating the leaves and fruits. The animal, whose nose-lip was long, the food got better. And in nature, as you know, survival of the more strong and fit. Gradually, from generation to generation, born animals in which the nose-lip was becoming longer and longer. And as a result of natural selection this part of the head has turned into a long, strong and flexible trunk, at the tip which has a sort of finger - elephant can capture even the smallest thing. Trunk of an elephant can pluck grass, branches from trees, pour the water. It can even blow the trunk! In short, this thing is the trunk.