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0.000000420 megatonnes is about four-fifths as heavy as a Grizzly Bear
In other words, it's 0.8060 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 1.240 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 0.0000005210 megatonnes. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
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