Tyrannosaurus Rex

Is that giant T-rex fossil you saw at the museum a boy or a girl? Even for paleontologists who devote their lives to studying dinosaur fossils, it’s a tough call, because the bones themselves rarely give away a dinosaur’s sex.

A smaller relative of Tyrannosaurus rex, the newly discovered Nanuqsaurus hoglundi, thrived in the extreme cold.

Is that giant T-rex fossil you saw at the museum a boy or a girl? Even for paleontologists who devote their lives to studying dinosaur fossils, it’s a tough call, because the bones themselves rarely give away a dinosaur’s sex.

A smaller relative of Tyrannosaurus rex, the newly discovered Nanuqsaurus hoglundi, thrived in the extreme cold.