Bear Dens

Maine Department of Inland Fisheries & Wildlife Black bear dens are much more inconspicuous than you might think. You can see why our biologists rely on collared bears and radio telemetry to locate dens!

Hollow dead trees are the most protected dens when they are big enough for black bears, but it doesn’t make it easy for our biologists to check on them during winter den surveys!
Not all black bears use a true den to go through torpor in winter! This in an example of a simple ground nest of a black bear tucked in a thicket.
It would be easy for this bear den to go unnoticed!

 

There’s a bear den in that tangled mess!
There’s a black bear den in that rock crevice!
Logging slash creates well-hidden bear den sites.
Black bears get creative with their winter dens. You could walk right by one and not even know!
Each winter, our biologists use radio telemetry to find collared bears and monitor the population. Without collars, we’d never find them! Here’s where we found bears this winter:
Blowdowns 37%
Stumps 21%
Brush piles 11%
Ground nests 11%
Excavations 5%
Tree dens 5%
Rock dens 5%
Other 5%
It won’t be long before bears sense spring and start meandering away from their excellent hiding spots. Most black bears in Maine are active from April 1 to November 1, but some emerge as early as March.
It’s not too early to remove, store, secure, and clean up common bear attractants in your yard such as bird feeders, garbage cans, and pet food.

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