New research has identified a dinosaur "mummy zone" in a series of ravines near Lusk, Wyoming. It's produced two mummies of a fleshy dinosaur with ...

A new specimen of one of the most controversial species of dinosaur has the potential to overturn decades of research on the ...

Nanotyrannus lethaeus was a fast, agile predator distinct from T. rex, with longer legs, stronger arms and a body built for ...

A groundbreaking analysis of the ‘Dueling Dinosaurs’ fossil has finally resolved a long-standing mystery in the world of ...

The debate over Nanotyrannus’ identity is finally over. A remarkably preserved fossil proves it was a mature species, not a teenage T. rex. This discovery rewrites how scientists understand ...

A Montana fossil dubbed Dueling Dinosaurs ended a decades-old debate over whether a 'pygmy tyrant' was real or just a teen T. rex.

A Montana fossil reveals that Nanotyrannus, once thought to be a young T. rex, was actually a full-grown predator and it's ...

Growth rings in fossilized bones suggest the diminutive dinosaur, Nanotyrannus, would never grow up to become a T. rex — plus ...

Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or another type ...

PHOENIX — Dozens of spectators, some as young as 9, crowded into City Hall to meet Victoria, one of the most complete Tyrannosaurus rex fossils uncovered to date. To oohs and aahs, Mayor Kate Gallego ...