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428.3760 kilograms is about four-fifths as heavy as a Grizzly Bear.
In other words, it's 0.8220 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 1.220 times that amount.
(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)
An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 521 kg. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
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