How Did T. Rex Have Sex?

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Now I have three words for you: Tyrannosaurus rex sex.

I recently had the opportunity to watch a team of paleontologists and large animal vets cut into a life-size, hyperrealistic model of the king of the Tyrannosaurs as they filmed a special event called T. Rex Autopsy for the National Geographic Channel.

At the end of the first day’s filming, the beast had been gutted. Fake blood and silicone viscera lay everywhere. And the monster’s eye, a combination of Jurassic Park and Sharptooth, stared dully at the ceiling.

But all I could think about was the dinosaur’s cloaca. Teeth, skull, feet, tail: Fossils can tell us what these looked like on a T. rex. But the cloaca—the all-inclusive organ out of which dinosaurs would have urinated, defecated, had coitus, and laid eggs—this beautiful organ is the gateway to many mysteries.