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420 kilograms is about four-fifths as heavy as a Polar Bear
In other words, it's 0.814 times the weight of a Polar Bear, and the weight of a Polar Bear is 1.23 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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