Einiosaurus - Caution - Day 30

Einiosaurus procurvicornis is a Cretaceous ceratopsian from Northwestern Montana. What is today plains, forests, and high mountains was then something remarkably similar, though lower in altitude - while so many dinosaurs we've found are from warm, wet places, Einiosaurus lived in a semi-arid temperate zone. We have fossils of juveniles and adults which give researchers a good idea of how the frill and horn developed over the course of the animal's life.