Deep Time

Locked in rock: Liberating America's giant raptors

Unlike its turkey-sized Mongolian cousin Velociraptor, Utahraptor is an elusive beast. Despite people's great interest in them, dromaeosaur fossils are pretty scarce in North America. The secrets of the raptors, however, may lie hidden inside a slab of sandstone. It is not an exaggeration to call this block one of the most important dinosaur discoveries ever.

Ask anyone to name some dinosaurs. Chances are, they will mention Velociraptor right after the mega superstar T. rex. All over the internet, we can hear the sound of hearts breaking when people find out that the sickle-clawed predator was no bigger than a turkey, and likely just as fluffy.


Little did they know, its all-American cousin Utahraptor, is actually as large as the oversized monsters from Jurassic Park.


Comparable to an adult bear in size, this 6.5 meter (21 ft) long hunter is the largest known member of the Dromaeosaur family, popularly known as raptors. In life, it would be taller than the average person today. The largest Utahraptor specimen discovered so far had a 22 cm (8.7 in) long sickle claw, a feature that would make it a fearsome hunter.