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The pair of shelled eggs is the first of its kind found inside a dinosaur, said researchers who reported the discovery in Friday’s issue of the journal Science.

Scientists found the dinosaur produced eggs in some ways like a crocodile and in other ways like a bird. Crocodiles and similar primitive reptiles have two ovaries enabling them to lay a clutch of eggs. Birds have a single ovary and can only lay one egg at a time.

The dinosaur’s egg-producing capability lay somewhere in between, suggesting a link with the modern bird, researchers said. It could produce more than one egg, but only one from each ovary at a time.

Source: Science, via AP