a stump of aspen piled by beavers

stump aspen piled beavers old beaver fells major chip work teeth saw activities animal bahaviour bark behavior biocenosis bionomics bite branches chew dam forest damage ecology felled foraging behaviour forestry gnaw gnawed water inhabitants life moose nature nibble nibbled stream traces vital wild wilderness wildlife wood castoridine beaverbelted tree harvesting food preparation construction huts dams