The creature known for building dams in rivers is the beaver. Beavers are remarkable engineers in the animal kingdom, using their strong teeth and sharp claws to fell trees and manipulate branches, mud, and stones to construct dams. These structures create ponds, which serve not only as protection from predators but also as a habitat for various aquatic and terrestrial wildlife. The work of beavers has a significant ecological impact, helping to regulate water levels, improve habitats, and promote biodiversity in their environments.