The relative sizes of an adult Albertosaurus tyrannosaur, two tyrannosaur babies (as determined by their fossilized remains), and lead scientist Dr. Greg Funston

Probably the world's most famous family of dinosaurs, the tyrannosaurs included the 40-ft (12-m) Tyrannosaurus rex within their ranks. Newly studied fossils now suggest that the reptiles were about "the size of a border collie" when first hatching from the egg.

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Category: Biology, Science

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