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680 kilograms is about one-and-one-third times as heavy as a Polar Bear
In other words, the weight of a Polar Bear is 0.7580 times that amount.
(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 352 and 680 kg. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.
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