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0.00000400 megatonnes is about one-and-one-tenth times as heavy as a Hippopotamus
In other words, it's 1.07 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.9350 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 0.000003750 megatonnes. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
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