Dino with ‘perfect and unique’ butt also had the oldest belly button known to science

Paleontologists have discovered the oldest navel known to science — and the first ever found in a non-avian dinosaur — in a 125-million-year-old fossil of a parrot-beaked biped in China.

The faint navel mark belongs to a reptile of the genus Psittacosaurus, who lived during the Cretaceous period (145 million to 66 million years ago). Scientists detected the long, thin trace of an umbilical scar when they exposed the fossil to a focused beam of laser light. The scar is a slight misalignment in the pattern of the skin and scales over the dinosaur abdomen and is the reptilian equivalent of a mammalian navel.

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