Beavers are large rodents well known for their skills at building dams and impregnable lodges. Their dams change landscapes by raising water levels, providing new habitat for many plants and animals.
There are more than 100 colonies of beavers in Yellowstone National Park. Peaceful, social beavers are safe in the water where they can dive to safety at the warning slap of a tail. Sometimes beavers are preyed on by patient predators if they can catch them by surprise on land.