Its arm bones are more robust and stockier, tipped with large, curved claws. It also had stout hands that imply a strong grip. Precisely how Shri used its arms and claws is unclear, though the researchers suggest it may have grappled with and grasped other dinosaurs like the horned herbivore Protoceratops. Bitten Protoceratops bones and a famous fossil of Velociraptor and Protoceratops locked in fossil combat, called the “Fighting Dinosaurs,” hint that the pig-like horned dinosaurs were prey for dromaeosaurs like Shri.
Michael Pittman, a paleontologist at the Chinese University of Hong Kong who was not involved in the research, says the authors’ hypothesis is reasonable, and that biomechanical studies of the dinosaur’s arms can potentially test the idea. He also calls the specimen, “beautiful and well-preserved.”
The likelihood Shri rapax and Velociraptor lived alongside each other points to a phenomenon called “niche partitioning.” Closely related species can sometimes share the same landscape when they have different dietary preferences and behaviors, like how the island of Madagascar hosts many different lemur species that live in different habitats and eat different foods.
Evolving different specializations allow related animals to divide habitats in different ways, boosting biodiversity. In the case of the dinosaurs, the anatomical differences between Shri and Velociraptor indicate that the carnivores were likely also part of such an ecological interplay.
Returning Shri rapax home
Because Shri’s skeleton was poached and sold with no geological information, paleontologists are unsure exactly from where the dinosaur was excavated, beyond its clear origin from Mongolia’s Djadokhta Formation. The fact that scientists have been able to study, describe, and begin to understand Shri rapax is a victory for paleontology and an effort to push back against black market fossil dealings.
“This case highlights yet another instance of fossil poaching,” Chinzorig says, “part of a long-standing pattern of illegal smuggling of fossils from the Mongolian Gobi over the decades.”
