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Hibernation functions to conserve energy when sufficient food is not available. To achieve this energy saving, an endothermic animal decreases its metabolic rate and thereby its body temperature. [3] Hibernation may last days, weeks, or months—depending on the species, ambient temperature, time of year, and the individual's body-condition.
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The male grizzly bear's hibernation ends in early to mid-March, while females emerge in April or early May. [53] In preparation for winter, bears can gain approximately 180 kg (400 lb), during a period of hyperphagia, before going into hibernation. [54] The bear often waits for a substantial snowstorm before it enters its den: such behavior ...
In the state's history there is only one documented fatality from a bear attack when a 22-year-old Rutgers University student was killed by a bear in West Milford in 2014.
By the time hibernation starts in October and November, males may weigh up to 1,200 pounds (540 kg). [9] These bears are known to consume as much as 120 pounds (54 kg) of salmon in a single day, sometimes catching as many as 30 fish daily. [10] Fish can help them gain up to 4 pounds a day, throughout the entirety of the season. [citation needed]
Meet the 2023 winner of Katmai National Park in Alaska, as well as the other 10 brown bears who gather at Brooks Falls to catch and eat the migrating sockeye salmon ahead of winter hibernation.
Although naturally-made dens are occasionally used, most dens are dug out by the bear. [68] During their time in hibernation, an American black bear's heart rate drops from 40 to 50 beats per minute to 8 beats per minute, and the metabolic rate can drop to a quarter of the bear's (nonhibernating) basal metabolic rate. These reductions in ...
A grizzly bear at Maryland Zoo was captured on CCTV struggling to stay awake as hibernation season approaches. During their long winter sleep, the body temperature of a bear dips to about 30-35C ...