Some monkeys win the genetic lottery. Others? Not so much. The ugliest monkey isn't a single species—it's a whole gallery of primates that make you do a double take, then wonder if evolution was playing a prank.

These animals aren't ugly because they're flawed. They're ugly because nature picked function over fashion.

Big noses, bald heads and bug eyes might not look cute, but they help these species survive. In fact, some of these features are essential tools that help primates thrive in specific environments, attract mates or avoid predators.

1. Proboscis Monkey

This species has the most iconic nose in the animal kingdom. The proboscis monkey’s oversized schnoz might look bizarre, but it actually works as a resonance chamber to attract females and warn off rival males.

Found in Bo

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