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  1. 北极熊
    北极熊大型肉食性哺乳动物
    保护人口威胁特征资料栖息地饮食寿命
     
  2. Polar Bears International
    https://polarbearsinternational.org/polar-bears-changing-arctic/polar-bear-facts/life...

    Life Cycle | Polar Bears International

    • Between April and late June, male polar bears search for female mates on the sea ice by following scented trails left by footpads. Mating takes place on the sea ice. But the fertile eggs don’t implant until the fall, and … 展开

    Denning Fall & Winter

    After feeding through the summer and fall, gaining as much weight as possible, pregnant female polar bears prepare to enter maternity dens to give birth to their cubs. To build a … 展开

    Polar Bears International
    Birthing

    Wild polar bear cubs are most often born in December. The mother gives birth to 1-3 cubs, … 展开

    Polar Bears International
    Polar Bear Cubs

    Totally dependent on their mothers, newborn cubs are blind, toothless, and covered with soft white fur. They weigh little more than 1/2 kg (1 lb) and are just 30-35 cm long (12 to 1… 展开

    Polar Bears International
    Emerging from Then Den

    Polar bear families generally emerge from their dens in March or April when the cubs are strong enough to survive in outside Arctic conditions and make the trek to sea ice. Now, mothe… 展开

    Polar Bears International
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    目录
    Denning Fall & Winter
    Birthing
    Polar Bear Cubs
    Emerging from Then Den
     
    • Mating (Spring) Between April and late June, male polar bears search for female mates on the sea ice by following scented trails left by footpads. ...
    • Denning Fall & Winter After feeding through the summer and fall, gaining as much weight as possible, pregnant female polar bears prepare to enter maternity dens to give birth to their cubs. ...
    • Polar Bear Cubs ...

    Life Cycle | Polar Bears International

    polarbearsinternational.org/polar-bears-changing-arctic/polar-bear-facts/life-cycle/
    polarbearsinternational.org/polar-bears-changing-arctic/polar-bear-facts/life-cycle/
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  2. 其他用户还问了以下问题
    How do polar bears mate?
    Between April and late June, male polar bears search for female mates on the sea ice by following scented trails left by footpads. Mating takes place on the sea ice. But the fertile eggs don’t implant until the fall, and only if the female has enough fat to sustain herself and her cubs during the long denning period.

    Life Cycle - Polar Bears International

    polarbearsinternational.org
    When do polar bears breed?
    However, with the advent of ecotourism in Arctic marine areas, particularly in Svalbard, ecotourism ships now regularly enter polar bear habitat from early April through the break-up of the sea ice in early summer. As a result, some of the natural history guides have reliably documented breeding behavior of polar bears through the end of June.

    The Amazing Breeding Behavior of Polar Bears - Arctic Focus

    arcticfocus.org
    How does sea ice affect polar bear mating behaviour?
    Provided by the Springer Nature SharedIt content-sharing initiative The dynamic sea ice habitat of polar bears (Ursus maritimus) influences their mating behaviour because it makes the distribution of mates unpredictable. Pr

    Behaviour and characteristics of mating polar bears

    link.springer.com
    How long does a polar bear mate?
    Upon successful courtship, the mating happens which usually lasts for several days. It’s important to note that polar bear reproduction is different from other species in the way that it features a unique process called delayed implantation.

    Polar Bear Reproduction: Learn & Save Arctic Life Now!

    polarbear-world.com
    What happens after a polar bear mate?
    After a successful mating, something extraordinary happens – the fertilized egg undergoes a process called delayed implantation. This crucial aspect of polar bear reproduction means the egg doesn’t immediately implant in the uterine wall, allowing the female to synchronize the birth of her cubs with optimal survival conditions.

    Polar Bear Reproduction and Life Cycle: From Cubs to Adults

    polarbears.com
    Are polar bears receptive to mating?
    Females with cubs were unlikely to be receptive to mating until offspring are weaned at 2.5 years old (Ramsay and Stirling 1988 ). Labial swelling is likely indicative of mating activity in polar bears. The increase in labial swelling with age suggests increased sexual activity, although the mechanism behind this is uncertain.

    Behaviour and characteristics of mating polar bears

    link.springer.com
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  3. WWF Arctic
    https://www.arcticwwf.org/.../polar-bear …

    Polar bear reproduction - WWF Arctic

    Learn how polar bears mate, fast, dig dens, and raise cubs in the Arctic. Find out how climate change affects their breeding cycle and habitat.

  4. polarbears.com
    https://polarbears.com/information-abo…

    Polar Bear Reproduction and Life Cycle: From Cubs to …

    The polar bear mating season typically spans from April to May. During this time, male polar bears embark on extensive journeys to find a mate, sometimes covering vast distances across the ice. The female’s scent signals her …

  5. Springer
    https://link.springer.com/article/10.1007/…

    Behaviour and characteristics of mating polar bears

    2019年3月20日 · The dynamic sea ice habitat of polar bears (Ursus maritimus) influences their mating behaviour because it makes the distribution of mates unpredictable. Pronounced sexual dimorphism of polar bears likely results …

  6. Polar Bear Facts and Information
    https://polarbear-world.com/polar-bear …

    Polar Bear Reproduction: Learn & Save Arctic Life Now!

    The reproductive habits of Arctic mammals play a crucial role in the survival of these unique species within the harshest climate conditions on earth. Like polar bear reproduction, these behaviors also revolve around the gathering, …

  8. Wikipedia
    https://en.wikipedia.org/wiki/Polar_bear

    Polar bear - Wikipedia

    The polar bear is white- or yellowish-furred with black skin and a thick layer of fat. It is more slender than the brown bear, with a narrower skull, longer neck and lower shoulder hump. Its teeth are sharper and more adapted to cutting meat. …

  9. arcticfocus.org
    https://www.arcticfocus.org/stories/amaz…

    The Amazing Breeding Behavior of Polar Bears - Arctic …

    Consequently, adult male polar bears are tasked with locating females that might be available to breed, but range at low densities over vast areas of sea ice. Thus, males may travel long distances in search of a mate, pausing only to carefully …

  10. Springer
    https://link.springer.com/chapter/10.1007/978-3-030-66796-2_14

    Polar Bear Reproductive and Denning Behavior | SpringerLink

  11. LibGuides
    https://ielc.libguides.com/sdzg/factsheets/polarbear/reproduction

    Reproduction & Development - Polar Bear (Ursus maritimus) Fact …

  12. Smithsonian Magazine
    https://www.smithsonianmag.com/videos/a-fertile...

    A Fertile Polar Bear's Hard Journey From Mating to Motherhood

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