We know a lot about fossils, but there's one thing about all those long-dead organisms that's hard to figure out -- their sex. So let's talk about the ways we can try to determine whether those T. rex bones came from a male or a female, and why figuring it out is so interesting!

Correction:
02:23 While female peafowl are more drab than males, the bird pictured here is an entirely different species: a helmeted guineafowl.

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