There is strong evolutionary pressure for bears to stay in their dens during winter, if there is little or no food available.
But bears will leave their dens on occasion, particularly when their den gets flooded or is badly damaged. Weather does play a role. In the colder, northern parts of Alaska, bears hibernate about 7 months of the year. Bears in the warmer, coastal regions of the state hibernate for months, with the longer hibernation time for bears raising newborn cubs. Bears have developed unique adaptive strategies in order to survive for so long without food and water.
They lower their body temperature degrees, and they break down fat stores for energy. Some protein is used as well, but bears largely conserve their muscle mass and thus do not become appreciably weaker during hibernation. Bears do wake up, however, and move around inside the den.
Bears will go through a lot of posture changes where they wake periodically to shift around. It is thought this helps prevent pressure sores from developing. Bears also shift positions to better conserve heat.
If food is present a bear does not have to hibernate, unless it is pregnant or winter conditions are severe enough such as found in Alaska. Visit website. Work is sending me Juneau AK for several months and I've been searching the net trying to find out approximately when brown and black bears in that area start hibernating.
The only thing I've found so far is "fall or early winter". Anyone here know? Performance Imagery. View portfolio Visit website Facebook Twitter. It really varies depending on weather, food source, elevation etc. I have seen tracks around here as late as November, and as early as March - but it is somewhat unusual.
When are you going? Joe can probably provide a better answer for the Mendenhall area. I'll be up there from about 1 Nov until the end of Feb. I'm pretty sure I'll miss them I would like to make a trip further up north during that time to try and get some Northern Lights images. I'll have 3 to 4 days off each week, so I need to start planning some photo trips!
Juneau can get some good Northern Lights if they aren't hidden by clouds. A ferry ride to either Haines or Skagway, and then a short, but speculator drive over the coastal range will put you in some prime Northern Light country. Speaking of Haines - it can be very good for eagles in November. Howdy from Juneau, Like Ron says, it all depends on weather, food, etc.
They wake up in April around these parts. Let me know if you'd like a tour of the area or a photo partner when you arrive. I'm also the defacto head of the Alaska Photographic Arrts Association here in Juneau really just a casual photo club. We meet during the Fall and Winter months. A big, beautiful state. Of mind. Start your adventure today. Get Inspired. See photos, videos, trip ideas, suggestions from Alaskans and more.
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