How did digits evolve? While it is clear that they derive from genetic programs already present in fish, their precise origin remains a matter of debate. An international team led by the University of ...

Despite the huge number of dinosaur fossils found, from bones to feathers, precious little exists in the fossil record to explain dinosaur defecation, urination, or copulation. Thankfully, all three ...

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Jan. 19 (UPI) --For the first time, scientists have described the cloaca, or vent, of a dinosaur -- the all-purpose opening used for reproduction and waste disposal. Many mammals have distinct ...

No one predicted that January 2021 would be a banner month for dinosaur news. Last week an article in the scholarly journal Cretaceous Research revealed that dinosaur bones in Argentina may have ...

A fossil dinosaur originally discovered in northwestern China is so exquisitely preserved that the shape of its cloaca – the opening used for excretion and mating – is visible for the first time. Only ...

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 ...