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450,000 grams is about nine-tenths as heavy as a Polar Bear.
In other words, it's 0.8720 times the weight of a Polar Bear, and the weight of a Polar Bear is 1.150 times that amount.
(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 516,000 grams. 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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