The animal known for building dams is the beaver. Beavers are remarkable engineers among animals; they construct dams using branches, mud, and other natural materials to create ponds and alter their habitat. These dams serve multiple purposes: they provide a safe refuge from predators, create a stable aquatic environment for food sources, and promote the growth of wetland ecosystems. Beavers play a crucial role in their environments, as the wetlands they create support a range of wildlife and contribute to biodiversity. Their activities also help to regulate water flow and improve water quality in ecosystems, demonstrating their ecological importance.