An elephant's trunk is the most conspicuous part of its body, but gaze upon an elephant skeleton and you'd never realize that such an appendage existed, as there are no bones to mark its presence.

The elephant's trunk contains over 40,000 muscles, divided into as many as 150,000 individual units! Compare that to the human body, which contains a paltry 639 muscles, and you start to get an idea how intricate the appendage is.

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