Beavers have 6 of these on their heads (in 2 sets of 3); 1 is transparent & helps in swimming underwater
They live on these sticks because once their pond freezes they will no longer 
have ... One of the primary reasons beavers build dams is to surround their lodge
... [DOC] [TLE] North American river otter - Wikipedia [PAR] The North American river otter (Lontra canadensis), also known as the northern 
river otter or the ...