It's about as heavy as a Rhinoceros
(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 1,400 and 2,800 kg. 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-one-tenth times as heavy as a Giraffe
In other words, 2,100 kilograms is 1.09 times the weight of a Giraffe, and the weight of a Giraffe is 0.9170 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 1,930 kg. 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 one-and-one-fourth times as heavy as a Car
It's about four-fifths as heavy as The Tongue of a Blue Whale
In other words, 2,100 kilograms is 0.780 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 1.30 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700 kilograms. 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-fifths as heavy as a Hippopotamus
In other words, 2,100 kilograms is 0.560 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 1.790 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,000 to 4,500 kg. 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 one-third as heavy as an Elephant
In other words, the weight of an Elephant is 2.90 times 2,100 kilograms.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100 kg. 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 kg
It's about one-third as heavy as a Tyrannosaurus rex
In other words, the weight of a Tyrannosaurus rex is 3 times 2,100 kilograms.(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 kilograms while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.