It's about one-and-one-tenth times as heavy as The Tongue of a Blue Whale.
In other words, the weight of The Tongue of a Blue Whale is 0.910 times 3,000 kilograms.(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 one-and-one-fifth times as heavy as a Giraffe.
It's about four-fifths as heavy as a Hippopotamus.
In other words, the weight of a Hippopotamus is 1.250 times 3,000 kilograms.(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-and-two-fifths times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.710 times 3,000 kilograms.(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-four-fifths times as heavy as a Car.
In other words, 3,000 kilograms is 1.8160 times the weight of a Car, and the weight of a Car is 0.55070 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 1,652 kg. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 386 kg.
It's about half as heavy as an Elephant.
In other words, the weight of an Elephant is 2 times 3,000 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 weigh up to 90 kg.
It's about half as heavy as a Tyrannosaurus rex.
In other words, 3,000 kilograms is 0.470 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 2.10 times that amount.(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.