Nature is known for its extremes. Not every animal is as cuddly as a giant panda or as cute as a teddy dog; some creatures are just plain bad looking – ugly, to be honest. Most people will not even give those extremely weird and ugly animals a second look. But every one of them has its natural role to fulfill with its specifically designed organisms.

Let's take a look at the 20 ugliest animals on the planet.

 Proboscis Monkey（長鼻猴）

The proboscis monkey, or long-nosed monkey, is a reddish-brown arboreal monkey that is endemic to the Southeast Asian island of Borneo. Its protruding nose makes this endangered creature easily identifiable. The monkeys honk to communicate with others and the nose straightens out during each honk.