Monoclonius

† Monoclonius is a Late Cretaceous ceratopsid from Montana, USA. Long considered a valid taxon but now often viewed as juveniles of other ceratopsids, it was a quadrupedal herbivore with a prominent nasal horn and large frill.

Diet & Feeding

Herbivore

Monoclonius 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

Monoclonius 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.