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How heavy is 12.5 tons?

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It's about as heavy as an Anchor of a Cruise Ship.
(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 12.5 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 one-and-a-half times as heavy as an Elephant.
In other words, 12.5 tons is 1.509 times the weight of an Elephant, and the weight of an Elephant is 0.6627 times that amount.
(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs between 8.283 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 0.09921 tons.
It's about one-and-four-fifths times as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 0.56 times 12.5 tons.
(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 7.1 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 three times as heavy as a Hippopotamus.
In other words, 12.5 tons is 3.02 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.331 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 4.13 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 four times as heavy as The Tongue of a Blue Whale.
In other words, 12.5 tons is 4.2 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 0.24 times that amount.
(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 3 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 four-and-a-half times as heavy as a Giraffe.
In other words, the weight of a Giraffe is 0.22 times 12.5 tons.
(Giraffa camelopardalis reticulata) (adult, male)
An adult, male giraffe weighs an average of 2.8 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 five-and-a-half times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.19 times 12.5 tons.
(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2.3 tons. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.