It's about nine-tenths as heavy as a Hippopotamus.
In other words, 3,200,000,000 miligrams is 0.853 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 1.17 times that amount.(Hippopotamus amphibius) (adult, male)
It's about one-and-one-fifth times as heavy as The Tongue of a Blue Whale.
In other words, the weight of The Tongue of a Blue Whale is 0.83 times 3,200,000,000 miligrams.(Balaenoptera musculus) (adult)
It's about one-and-three-tenths times as heavy as a Giraffe.
In other words, the weight of a Giraffe is 0.77 times 3,200,000,000 miligrams.(Giraffa camelopardalis reticulata) (adult, male)
It's about one-and-a-half times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.67 times 3,200,000,000 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.
It's about one-and-nine-tenths times as heavy as a Car.
In other words, 3,200,000,000 miligrams is 1.937 times the weight of a Car, and the weight of a Car is 0.5163 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
It's about half as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 2 times 3,200,000,000 miligrams.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
It's about two-fifths as heavy as an Elephant.
In other words, 3,200,000,000 miligrams is 0.4259 times the weight of an Elephant, and the weight of an Elephant is 2.348 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs between 7,514,000,000 miligrams. Among African elephants, both males and females have tusks (female Asian elephants lack tusks) which can grow to 3 m (10 ft) and weigh up to 90,000,000 miligrams.