An elephant's most obvious part is the trunk. The trunk is a very long nose, made from the upper lip. An elephant uses its trunk to grab objects such as food. Though the rest of an elephant's skin is strong and thick, its trunk is very soft and sensitive. Elephants avoid Acacia trees with ants because they can bite the inside of an elephant's trunk. The trunk is also used when it trumpets. The elephant usually stands still, raises its trunk, and blows. This is a signal to other elephants and wildlife.