You know dogs, right? And cats? And weasels, and deer, and kangaroos, and pretty much every other mammal? Well, one thing they all have in common is that, for the most part, the hair all over their bodies is about the same length. So why is it that humans don't have a nice, even coat? The how of hair we understand pretty well. The why? That's a little trickier.
Hair Today, Gone Tomorrow
A Natural (Selection) Look
Why Body Hair?
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Key Facts In This Video
All hair is made of the protein keratin. 00:37
Different types of hair have growth phases of differing lengths, which is why your underarm hair can only grow to a few inches long. 01:30
Humans may have evolved pubic and underarm hair to trap and transmit pheromones to potential mates. 03:24
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