Achelousaurus horneri

Unlike its relative Triceratops, this lesser-known horned dinosaur had no horns on its brow. Instead, it had two long spikes on the back of its frill, the bony extension behind its skull. Fossils of this plant-eater have been found in Montana.

Image credits: main image, Rick Spears.

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Its brow horns and snout horn inspired this dinosaur's name, which means "three-horned face."

PaleontOLogy

Meet some of the more unusual members of T. rex and Velociraptor's family tree.