It's about as heavy as a Hippopotamus.
It's about one-and-two-fifths times as heavy as The Tongue of a Blue Whale.
In other words, the weight of The Tongue of a Blue Whale is 0.710 times 3,750,000 grams.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700,000 grams. 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 an Elephant.
In other words, 3,750,000 grams is 0.620 times the weight of an Elephant, and the weight of an Elephant is 1.60 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100,000 grams. 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 4,000,000 grams
It's about three-fifths as heavy as a Tyrannosaurus rex.
In other words, 3,750,000 grams is 0.590 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 1.70 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 6,400,000 grams 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-four-fifths times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.560 times 3,750,000 grams.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2,100,000 grams. 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-nine-tenths times as heavy as a Giraffe.
In other words, 3,750,000 grams is 1.940 times the weight of a Giraffe, and the weight of a Giraffe is 0.5150 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 1,930,000 grams. 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 two-and-a-half times as heavy as a Car.
In other words, 3,750,000 grams is 2.270 times the weight of a Car, and the weight of a Car is 0.44050 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 1,652,000 grams. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 386,000 grams.