Bizarre Ancient Creatures

New fossils suggest that Spinosaurus was a terror of Cretaceous seas

Ancient flying reptile had throat pouch that may have let it snatch fish from the water

Titanosaur was twice as long as T. rex, likely had no natural enemies

A 435-million-year-old fossil from Wisconsin may give mysterious "thylacocephalans" a twig on the family tree

New research suggests burrowing sea creatures moderated global oxygen levels, allowing animals to evolve