These semi-aquatic rodents plaster their lodges with mud
In 
winter, when the mud-plastered lodge freezes it is almost impossible for a... [DOC] [TLE] Facts About Beavers - Live Science [PAR] Oct 13, 2015 ... Beavers are well-adapted for semi-aquatic life, with thick waterproof fur, ... 
Beavers are among the largest living rodents in the world.