Scientists discovered a fossil of a dome-headed dinosaur in Mongolia’s Gobi Desert. The new species, named Zavacephale rinpoche, lived 108 million years ago and is the earliest known pachycephalosaur.

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• Fossil found in Mongolia’s Gobi Desert
• Belongs to new species Zavacephale rinpoche
• Dinosaur lived about 108 million years ago
• Oldest known member of pachycephalosaur group
• Juvenile fossil, about 1 metre long, under 6 kg
• Skull dome made of single bone, with spikes and nodes
• Dome’s purpose debated: mating, social display, head-butting
• Discovery predates other fossils by 15 million years
• Fossil shows gastroliths, stones used to grind plants
• Environment had lakes, turtles, fish, early crocodile relatives