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How heavy is 491 miligrams?

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It's about 0.0000008 times as heavy as The Heart of a Blue Whale.
In other words, 491 miligrams is 0.0000008 times the weight of The Heart of a Blue Whale, and the weight of The Heart of a Blue Whale is 1,000,000 times that amount.
(Balaenoptera musculus) (adult)
The heart of a blue whale weighs about 600,000,000 miligrams. These hearts pump an estimated 7,100 L (1,875 gal) of blood through the whale's massive body.
It's about 0.0000007 times as heavy as a Cow.
In other words, 491 miligrams is 0.00000072 times the weight of a Cow, and the weight of a Cow is 1,400,000 times that amount.
(for Holstein, a.k.a. Holstein Friesian, a.k.a. Friesian, Bos primigenius) (adult, heifer)
A mature Holstein cow (the well-known black-and-white, spotted breed of cow) typically weighs 680,000,000 miligrams. President William Howard Taft (1909 - 1913) kept a Holstein cow named Pauline Wayne on the White House grounds — a gift from a Wisconsin senator and the source of the First Family's milk.
It's about 0.0000003 times as heavy as a Car.
In other words, 491 miligrams is 0.0000002972 times the weight of a Car, and the weight of a Car is 3,365,000 times that amount.
(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 1,652,000,000 miligrams. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 386,000,000 miligrams.
It's about 0.0000003 times as heavy as a Rhinoceros.
In other words, 491 miligrams is 0.00000023 times the weight of a Rhinoceros, and the weight of a Rhinoceros is 4,300,000 times that amount.
(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.
It's about 0.0000002 times as heavy as a Giraffe.
In other words, 491 miligrams is 0.0000002 times the weight of a Giraffe, and the weight of a Giraffe is 5,000,000 times that amount.
(Giraffa camelopardalis reticulata) (adult, male)
An adult, male giraffe weighs an average of 2,500,000,000 miligrams. Reaching 5.5 m (18 ft) in height by adulthood, giraffe calves can grow as much as 3 cm (1 in) per day.
It's about 0.0000002 times as heavy as The Tongue of a Blue Whale.
In other words, 491 miligrams is 0.00000018 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 5,600,000 times that amount.
(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700,000,000 miligrams. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.
It's about 0.0000002 times as heavy as a Hippopotamus.
In other words, 491 miligrams is 0.000000131 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 7,630,000 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,750,000,000 miligrams. 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).