They breathe once every 45 seconds, and have a heartbeat of 8-21 beats per minute.Īll of this sounds incredibly stressful for the bear’s body, but the bear’s ability to recycle nitrogen as they metabolize their fat and turn that nitrogen into protein prevents a true state of starvation. They do not eat, drink, urinate, or defecate. Some protein is used as well, but bears largely conserve their muscle mass and do not become noticeably weaker during hibernation. While in the den, they lower their body temperature 8-12 degrees, and break down fat stores for energy.
On average though, the bears of Yellowstone hibernate for five months, with black bears going to den first, normally in October, followed by pregnant female grizzlies, and large male grizzlies going to den last. Male polar bears often don’t den at all and the grizzlies of Yellowstone have been known to wake up randomly during the winter and leave their den. Additionally, not all bears hibernate, and those that do don’t hibernate equally.īlack bears in Mexico might hibernate for only a few days, while grizzlies in Alaska might stay in the den for up to six months. Many people have argued that bears do not truly hibernate because the bear’s body temperature stays above 88 degrees which is quite warm. The first big question that most people ask is, are bears true hibernators? Nebraska – Great Sandhill Crane Migration.4 Day Grand Teton & Yellowstone Winter Tour.Yellowstone Winter Wolf Tour 4 Day / 3 Night.Yellowstone Private Wildlife & Scenic Day Tour.Yellowstone Old Faithful, Waterfalls and Wildlife Day Tour.Grand Teton and Native American Petroglyph Tour.4 Day Grand Teton and Yellowstone Winter Adventure.
Do bears hibernate full#
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