These semi-aquatic rodents plaster their lodges with mud
The mud is plastered down by the fore-feet, and not, as often supposed,... [DOC] [TLE] Tracking Tips: Beavers at Home for the Winter | Autumn 2015 [PAR] Nov 24, 2015 ... Conical or dome-shaped lodges surrounded by water are also recognizable 
signs ... by dams built of sticks, stones, and mud are created by beavers.