Relevant points...
1. It's generally cultural, with occasional practical applications that would not be practical for other apes to copy.
2. Cultural appearance mores are not unique to humans. Link to article about chimps using blades of grass as earrings.
3. This particular cultural mōs isn't even that widespread among humans (there are many human cultures where females do not shave).
4. Someone said, humans do not have fur and explained shaving in terms of its possible ancient practical applications. Humans have similar follicle densities as the other apes. Whether called hair, fur, or horns for that matter its all made of the same chemical, specialized in each animal by adaptation.
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