A newly described Patagonian fossil reveals the evolutionary origins and global spread of the tiny alvarezsaur dinosaurs.

Roughly 425 million years ago, in the warm seas over what is now southern China, there lived a meter-long bony fish with jaws ...

"Nine jaws we've found have this twist, including the really well-preserved ones, so it's not a deformation." ...

The fossilized remains of a creature with a twisted jaw and sideways-facing teeth have been discovered in the Amazon jungle. Scientists say the plant eating reptiles now called Tanyka consisted of ...

Paleontologists surveying a dry riverbed in northeastern Brazil repeatedly encountered the same type of fossil: a lower jaw ...

"It's a really strange animal, and the weird twist in the jaw drove us crazy trying to figure it out." ...

A nearly complete 90-million-year-old dinosaur fossil from Patagonia, Alnashetri, reveals how alvarezsaurs evolved and shrank over time.

Scientists discovered a bizarre 275-million-year-old aquatic animal with sideways teeth and a twisted jaw in Brazil, revealing a rare “living fossil” lineage from the Permian period.

More than half a billion years ago, the Grand Canyon was not the arid landscape we know today but a shallow, tropical sea teeming with strange life. Now, scientists have uncovered a remarkable fossil ...

Forgotten fossils from the Kimberley show how marine amphibians rebounded and spread across the globe after the end-Permian mass extinction.

These “total monsters of fishes” are extinct today, though new clues about their lives come from CT scans and their closest living relatives: the big-eyed ratfish of the deep sea Strange fossils ...

Learn how Permian-era fossils from Brazil led researchers to a tetrapod with a twisted jaw from a lineage once thought ...