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How heavy is 6.3 long tons?

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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 6.3 long tons 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 nine-tenths as heavy as an Elephant.
In other words, 6.3 long tons is 0.8519 times the weight of an Elephant, and the weight of an Elephant is 1.174 times that amount.
(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs between 7.395 long tons. 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 0.08858 long tons.
It's about one-and-seven-tenths times as heavy as a Hippopotamus.
In other words, 6.3 long tons is 1.71 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.585 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3.69 long tons. 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, 6.3 long tons is 0.566 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 1.77 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 11.1 long tons. 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 0.42 times 6.3 long tons.
(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2.7 long tons. 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 two-and-a-half times as heavy as a Giraffe.
In other words, the weight of a Giraffe is 0.38 times 6.3 long tons.
(Giraffa camelopardalis reticulata) (adult, male)
An adult, male giraffe weighs an average of 2.5 long tons. 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 three times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.33 times 6.3 long tons.
(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2.1 long tons. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.