Maiasaura peeblesorum is a hadrosaur that lived during the Late Cretaceous (Campanian stage) in what is now North America. Measuring about 9 meters in length, skeletons of Maiasaura (meaning "good mother lizard") has been found in proximity of a series of nests with remains of eggshells and hatchlings. This was the first direct proof (the discovery has been made in the 1970s) that some dinosaurs lived in herds, raised and feed their offsprings. Remains of this animal, which consist of more than 200 skeletons, embryos, hatchlings, subadults and adults are so far only known from the Two Medicine Formation in Montana.
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They drew first blood, not me.
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They drew first blood, not me.