1st of their kind baby tyrannosaur fossils unearthed

A fossil of what may be a tyrannosaur embryo shows that the gigantic apex predator started out with a skull the size of a mouse.

That conclusion came after the study authors found a toe claw from a baby tyrannosaur in Alberta, Canada in 2017 — which prompted them to analyze  a previously known baby tyrannosaur jawbone, found in Montana in 1983. Because the jawbone was too delicate to be removed from the surrounding rock, it had never been properly studied. But now, an analysis of both fossils is revealing all kinds of secrets about these baby beasts.

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