The grey lemming is a small, rodent-like mammal found in the Arctic tundra regions of North America. Synonyms for this creature include the collared lemming, Arctic lemming, and tundra lemming. These animals are often mistaken for mice, but their round ears and stocky bodies set them apart. Grey lemmings are important prey for many predators in the Arctic, such as snowy owls and arctic foxes. They are known to have cyclic population booms and busts, which greatly affect the local ecosystem. Despite their small size, grey lemmings play a crucial role in maintaining a healthy balance within their Arctic habitat.