Meet Lucy's hunter, a massive, horned crocodile that likely terrorized early human ancestors in ancient Ethiopia.

Tyrannosaurus rex is one of the most recognizable names of the dinosaur world, a hulking and terrifying meat-eating behemoth.

The fossil measured only 4 centimeters, nowhere near the giants that made Arthropleura famous. Yet this small specimen, found at Montceau-les-Mines in France, ended up yielding one of the missing ...