Castoroides, commonly known as the giant beaver, lived in North America during the Pleistocene epoch. It was much larger than modern beavers, reaching lengths of up to 2.5 meters. Unlike today's beavers, Castoroides did not build dams and likely inhabited large lakes and slow-moving rivers.

Castoroides, commonly known as the giant beaver, is native to North America. Its distribution primarily included the Great Lakes region of the United States and Canada, extending as far south as Florida and as far north as Alaska during the Pleistocene epoch.

Castoroides inhabited wetland environments such as lakes, rivers, and swamps. These areas provided the necessary resources for their survival, including abundant water and vegetation.

As a semi-aquatic rodent, Castoroides played a significant role in its ecosystem by constructing lodges and dams, similar to modern beavers. These structures helped in water regulation and provided habitats for other species. The giant beaver primarily fed on aquatic plants, bark, and soft vegetation, which shaped its foraging behavior and habitat preferences.