Did Dinosaurs Have Dicks?

Sam Westreich, PhD
Sharing Science
Published in
5 min readDec 21, 2020

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After a recent zoo trip, I gotta know. Here’s what we know with (rock) hard certainty.

A dinosaur from the Oakland Zoo’s Glowfari, which inspired this discussion. Note the lack of genitals — is this accurate? (Author’s image.)

Recently, in an effort to not spend literally all of our time social distancing inside our house, my wife and I took a trip to the Oakland Zoo for some evening entertainment — a Glowfari.

The zoo is now running an evening program, open to the public with a reservation purchased in advance, where visitors can wander around the zoo grounds. Instead of seeing animals, however — who generally don’t glow and aren’t that interesting to look at after dark — the zoo has dozens of large, lit up, animated statues of various animals.

Of course, no one expects these glowing statues to be completely anatomically correct. However, while wandering through the Land of the Lost section, an interesting question was raised about the dinosaurs.

Namely, did male dinosaurs have penises?

It’s… not the sort of question that’s usually covered in children’s books, which is why I don’t know the answer from my childhood wealth of knowledge about most things dinosaurs.

But it’s a scientific question and I want answers — let’s do some research and try to figure out how dinosaurs had sex!

Sadly, Dongs Don’t Age Well

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Sam Westreich, PhD
Sharing Science

PhD in genetics, bioinformatician, scientist at a Silicon Valley startup. Microbiome is the secret of biology that we’ve overlooked.