It's about as heavy as a Tyrannosaurus rex.
(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 6,400,000 grams while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about one-and-one-tenth times as heavy as an Elephant.
In other words, the weight of an Elephant is 0.910 times 6,400,000 grams.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100,000 grams. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 4,000,000 grams
It's about one-and-seven-tenths times as heavy as a Hippopotamus.
In other words, 6,400,000 grams is 1.710 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.5850 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,750,000 grams. 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).
It's about three-fifths as heavy as an Anchor of a Cruise Ship.
In other words, 6,400,000 grams is 0.5660 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 1.770 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 11,300,000 grams. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about two-and-a-half times as heavy as The Tongue of a Blue Whale.
In other words, the weight of The Tongue of a Blue Whale is 0.420 times 6,400,000 grams.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700,000 grams. 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 three times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.330 times 6,400,000 grams.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2,100,000 grams. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about three-and-a-half times as heavy as a Giraffe.
In other words, 6,400,000 grams is 3.320 times the weight of a Giraffe, and the weight of a Giraffe is 0.3010 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 1,930,000 grams. Reaching 5.5 m (18 ft) in height by adulthood, giraffe calves can grow as much as 3 cm (1 in) per day.