Baby tyrannosaur dinosaurs were the size of dogs, embryo fossils show - CNET

Tyrannosaur dinosaurs roamed Earth long before baby photos were a thing, so all we have is the fossil record to figure out what they looked like in their earliest days.

It's been a difficult quest, but the discovery of "the first-known fossils of tyrannosaur embryos" is helping to create a picture.

A research team led by University of Edinburgh paleontologist Greg Funston studied a tiny jaw bone and claw fragments that belonged to cousins of the famous Tyrannosaurus rex.