That is a serious threat up there. You have to have your head screwed on straight all the time and aware of your surroundings, or so I am told...
They blend in. Everything is white...
I knew someone, Timothy Treadwell, who studied bears and was killed by a grizzly. Wild animals are wild and are unpredictable. Very sad all around.
Polar bears are now four times the population since they first started keeping track in 68. They should open a season up.