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 277 firkins. 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-four-fifths times as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 0.560 times 277 firkins.(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 160 firkins 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-nine-tenths times as heavy as an Elephant.
In other words, the weight of an Elephant is 0.530 times 277 firkins.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 150 firkins. 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 weigh up to 2.20 firkins.
It's about three times as heavy as a Hippopotamus.
In other words, 277 firkins is 3.02 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.3310 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 91.90 firkins. 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, 277 firkins is 4.20 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 0.240 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 66 firkins. 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.
It's about five-and-a-half times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.190 times 277 firkins.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 51 firkins. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.