Maiasaura peeblesorum, the 'good mother lizard,' was a herbivorous dinosaur from the Late Cretaceous period. Known for its nurturing behavior, it lived in large colonies and cared for its young. It had a flat, duck-billed snout and a bulky body, thriving in the lush landscapes of what is now Montana, USA.

Maiasaura peeblesorum, commonly known as Maiasaura, is a dinosaur species that lived during the Late Cretaceous period, approximately 76.7 million years ago. Its fossils have been predominantly found in the Two Medicine Formation of Montana, USA, indicating that this region was part of its native habitat during that era.

The environment of the Two Medicine Formation during the Late Cretaceous was characterized by a semi-arid climate with seasonal rainfall. It included floodplains, river channels, and a series of small inland lakes and wetlands. This region had a diverse array of plant life, including conifers, ferns, and flowering plants, which would have provided ample food for the herbivorous Maiasaura.

Maiasaura was a large herbivorous dinosaur that likely inhabited the floodplains and forested areas of its native region. It is well-known for its nesting behavior and is considered to have lived in colonies, suggesting a social structure that might have offered protection for the young. The species is known for its nurturing behavior, as evidenced by fossilized nesting sites that indicate adults cared for their young. Maiasaura's ecological niche would have involved foraging for vegetation and possibly migrating to find food and suitable nesting sites.