In 2004, scientists digging in China discovered a fossil that changed the way we saw dinosaurs. It was a Psittacosaurus , a horned herbivore that lived around 120 million years ago. It wasn’t alone in death, however, as scientists found the fossils of 34 offspring huddled around it. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

It was one of the earliest pieces of evidence that some form of parental care existed among dinosaurs, and could explain why we see parental instincts in modern-day birds and reptiles. We don’t know if this Psittacosaurus was a male or female, but then the idea that parental care is sex-specific is something of a mammalian outlook – a lens that’s often gotten in the way of us understanding dinosaur beh

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