Ornithomimus tenuis

† Ornithomimus tenuis is a Late Cretaceous ornithomimid from Montana's Hell Creek Formation. A lightly built omnivore ~3.5 m long, it was among the last surviving members of the ornithomimosaur lineage before the K-Pg extinction.

Diet & Feeding

Herbivore

Ornithomimus tenuis was a plant-eating dinosaur. Herbivores typically fed on ferns, cycads, conifers, and other vegetation available during their era. Many herbivorous dinosaurs developed specialized teeth and digestive systems for processing tough plant material.

Time Period

Cretaceous Late Mesozoic Era

Ornithomimus tenuis lived during the Cretaceous Late period of the Mesozoic Era, approximately 100.5 to 66.0 million years ago.

The final age of dinosaurs, featuring iconic species like Tyrannosaurus rex, Triceratops, and Velociraptor. Dinosaurs reached their peak diversity before the catastrophic asteroid impact at the Chicxulub crater ended the Mesozoic Era.