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The weight of polar bears fluctuates during the year, as they can bulk up on fat and increase their mass by 50 percent. [31] A fattened, pregnant female can weigh as much as 500 kg (1,100 lb). [35] Adults may stand 130–160 cm (4.3–5.2 ft) tall at the shoulder. The tail is 76–126 mm (3.0–5.0 in) long. [10]
Brickner earned his nickname, "The Human Polar Bear," when local residents often saw him swimming in the Monongahela River behind ice-breaking ships in the middle of a cold winter snap the area was known for. [3] The river is well used by commercial barge traffic, and long thick freezes of the river required ice-breakers to be brought in.
Researchers tracked polar bears with GPS system collarsand recorded long-distance swims up to 354 kilometres (220 mi), with an average of 155 kilometres (96 mi), taking up to ten days. [89] A polar bear may swim underwater for up to three minutes to approach seals on shore or on ice floes while hunting. [90] [91]
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A bull southern elephant seal is about 40% heavier than a male northern elephant seal (Mirounga angustirostris), which is nearly twice the weight of a male walrus (Odobenus rosmarus), [6] [7] or 6–7 times heavier than the largest living mostly terrestrial carnivorans, the Kodiak bear and the polar bear. [8] [9]
The Martha’s Vineyard Polar Bears group was founded in 1946 as a safe space for Black swimmers and now people go there every summer to exercise in the cold waters.
A polar bear (top) and Syrian brown bear (bottom) An animal, described as a "pale" or "white" bear, was given to Henry by Haakon IV of Norway in 1252. [ 2 ] [ 3 ] The species of the animal is not known definitively, but it was most likely a polar bear ; [ 3 ] polar bears were known as white bears in Britain before the 19th century. [ 4 ]
The Polar Bear Plunge event in Maryland is the largest polar bear plunge in the United States. It is held annually at Sandy Point State Park and raises funds for the Special Olympics. [ 42 ] Sponsored by the Maryland State Police , in 2007, Plungapalooza raised $2.2 million and had 7,400 participants. [ 43 ]