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A herbivorous hadrosaurid dinosaur of the genus Maiasaura of the Cretaceous Period. Remains of fossilized nests and juveniles suggest that the adults cared for their young.

[New Latin Māiasaura, good mother lizard, genus name : Greek maia, good mother; see mā- in Indo-European roots + New Latin saura, feminine of saurus, lizard (from Greek sauros).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Palaeontology) a species of large, herbivorous, duck-billed dinosaur
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(mī′ə-sôr′ə) or mai·a·saur (mī′ə-sôr′)
A duck-billed dinosaur of the late Cretaceous Period of North America. Its remains suggest that the adults lived in herds and cared for their young in large nesting sites.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Featuring thirty-eight original puzzles covering all of the most popular species, from Velociraptor and Stegosaurus to Triceratops and Tyrannosaurus Rex, "Making Wooden Dinosaur Toys and Puzzles" also offers two spectacular puzzle dioramas featuring a Maiasaur mama with her babies, and a T-Rex on the attack.
From regular maintenance of objects on permanent display to initiatives such as the Maiasaur fossil preparation lab--which in the mid 1990s allowed visitors to watch as the fossil was painstakingly released from bedrock that encased it--in situ conservation is essential to the ROM's protocol of keeping the collection in stable condition.
The Museum of the Rockies in Montana, USA now owns Egg Mountain, noted for the discovery of Maiasaur fossils (Horner and Dobbs 1997).
Institutions and museums throughout the state invite paying volunteers of all ages to help unearth everything from Griffen, the 150-million- year-old stegosaurus, to maiasaur nesting sites, troodon eggs, daspletosaurs, and even Tyrannosaurus rexes.
Near Egg Mountain, there also are maiasaur and troodon nesting areas to visit as well as a campasaur bone bed containing the bones of about 2,000 dinosaurs.
The fossil evidence even shows that maiasaur adults stuck around to protect and raise their young.
"Can we say this dinosaur was red in color?" he said, gesturing to the reddish plastic skin of the animatronic maiasaur. "No.
The scientists found fossils of maiasaur (MY-uh-sore) eggs, nests, young, and adults all together in the same place (below).
The fossil maiasaur nests had lots of little shell pieces in them too.
Look at Tyrannosaurs, Triceratops, and Maiasaurs roaming nearby.
The growth plates--never before seen in dinosaur fossils--were discovered in the well-preserved bones of young maiasaurs found in the nesting sites of the Two Medicine Formation in northwestern Montana.
There is ample evidence that some dinosaurs, such as maiasaurs, nested communally, watched over their eggs, and cared for their young.