Attack dogs then flushed a mother bear and her two cubs from the silence of their winter den.

Then, take those innovations to your winter den and mull them over.

Black bears, it found, lose only about 25 percent of their muscle strength while in their winter den.

Every year, ten thousand snakes trying to get to or from their winter dens had been crushed under the wheels of vehicles.

Another good time to go is early September, when the snakes slither back down to their winter dens.

Often, the same winter den is repeatedly used.

A mother emerges from her winter den with cubs, and leads them on to the sea ice to hunt.

The flies, he determined, were using the hospital for a winter den, entering the building through tiny holes in the brick walls.

Except for their winter dens, it did not occur to them that anyone might not have a perfect right to be anywhere.

Some urban bears did not have winter dens at all.