Aquatic Mammal Education Materials
American beavers build some impressive homes out of vegetation they cut down with their powerful rodent teeth. They also build dams in the same fashion to help slow erosion of their homes and keep the water calm around their chambers.
Mink and river otter are found in Colorado, usually along the rivers of the mountains. River otters are a threatened species, and thus are very rare to see. However, you can help both of these species by keeping water systems healthy by not littering or dumping chemicals. You can also help them by slowing down on mountain roads and safely stopping for them when they are trying to cross the road.