What did a dinosaur’s butt look like? This fossil tells us.:

For the entirety of my career as a journalist covering paleontology, I’ve been wanting to know: What does a dinosaur’s butthole look like? When I wrote My Beloved Brontosaurus, a book about dinosaur biology, the chapter on reproduction required a lot of time imagining the nature of a Jurassic behind; one had yet to be found preserved. Even dinosaur models and sculptures often demur on the point of the dino butt, leaving the terrible lizards with terrible constipation.

Now I finally have a clearer view, thanks to a fossil of a horned dinosaur called Psittacosaurus, described in a paper online earlier this month. These dinosaurs, which lived over 100 million years ago in what’s now northeastern China, were odd little creatures. While belonging to the same branch of the dinosaur family tree as Triceratops, these Labrador retriever—size dinos walked around on two legs and had beaks like those of parrots, cheeks that were each adorned with a flared horn, and, jutting from the tail, a spray of featherlike bristles. Now we also know that they had buttholes like those of crocodiles.

God damnit the Internet is great.