Fun Facts

• Maiasaura means "good mother lizard."
• Lived about 76-74 million years ago during the Late Cretaceous Period.
• Adults were about 30 feet long and weighed 3 tons.
• Egg Mountain in Montana was named an International Geoheritage Site in 2025.
• Nests held up to 20 eggs, and babies stayed in the nest for two months.
• Maiasaura grew fast-10 feet in one year!
• They had hundreds of teeth for grinding tough plants.