Polar bear sex

Andrew E. Sexual dimorphism in body mass, body length, head width, head length, and foreleg guard hair length of polar bears Ursus maritimus was examined from live-captured polar bears in Svalbard, Norway. Limited evidence of sexual dimorphism was apparent in cubs shortly after den emergence but was marked after the 1st year of life. Sexual dimorphism in adults resulted from both a higher growth rate and prolonged growth period in males.
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Polar Bears International

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Animal Sex: How Polar Bears Do It | Live Science

With the exception of family groups, most polar bears on the sea ice are solitary, traveling extensively over home ranges that may vary in size from a few thousand to hundreds of thousands of square kilometers. This makes extended observations of the undisturbed behavior of wild polar bears difficult to obtain but extremely valuable when opportunities arise. Collectively, scientists were already accumulating vast amounts of information on polar bear movements by observing where tagged polar bears were recaptured relative to where they were first captured and, later, from the use of satellite radio collars. Similarly, we obtained a great deal of new information from body measurements and specimens collected from bears while they were briefly immobilized for tagging. However, I felt it was still critical to understand what polar bears spent their time doing when they were not disturbed by scientists in helicopters or Inuit hunters. In other words, I wanted to just let the bears show us, at their own speed, what it meant to be a wild undisturbed bear on the sea in the Arctic. To do this, we used telescopes from cliff-top observation cabins at Radstock Bay, Devon Island, in the Canadian High Arctic that were high enough that the bears were unaware of our presence.
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Animal Sex: How Polar Bears Do It

As the largest land carnivores currently on the planet, polar bears are fearsome predators and the masters of their Artic domain. But do these hulking animals also have a softer side toward each other, or are their mating behaviors just as cold and unforgiving as their frozen habitat? It's not unusual for a male to track and follow a female for many miles, and males may even try to herd a female to isolated areas on the top of islands, in small bays or up on high cliffs, in an attempt to monopolize mating and reduce competition from other mates. However, observational studies suggest these attempts fail more often than not, given that females are frequently seen among groups of competitive males. They also have "guard hairs" on their forelegs that are noticeably longer than those on females.
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