Is 491 miligrams as heavy as a Rhinoceros?
It's about 0.0000003 times as heavy as a Rhinoceros
The weight of a Rhinoceros is about 2,100,000,000 miligrams.
(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2,100,000,000 miligrams. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
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