It's about 300 times as heavy as a Rhinoceros
In other words, the weight of a Rhinoceros is 0.0033 times 635,000 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-three-hundredth as heavy as The Sears Tower
In other words, 635,000 kilograms is 0.003147 times the weight of The Sears Tower, and the weight of The Sears Tower is 317.80 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800,000 kilograms. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 350 times as heavy as a Giraffe
In other words, 635,000 kilograms is 329 times the weight of a Giraffe, and the weight of a Giraffe is 0.00304 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 400 times as heavy as a Car
It's about one-five-hundredth as heavy as The Empire State Building
In other words, 635,000 kilograms is 0.00192 times the weight of The Empire State Building, and the weight of The Empire State Building is 521 times that amount.(New York City, New York)
The Empire State Building weighs approximately 331,000,000 kilograms. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 950 times as heavy as a Cow
In other words, the weight of a Cow is 0.0011 times 635,000 kilograms.(for Holstein, a.k.a. Holstein Friesian, a.k.a. Friesian, Bos primigenius) (adult, heifer)
A mature Holstein cow (the well-known black-and-white, spotted breed of cow) typically weighs 680 kg. President William Howard Taft (1909 - 1913) kept a Holstein cow named Pauline Wayne on the White House grounds — a gift from a Wisconsin senator and the source of the First Family's milk.
It's about 1,000 times as heavy as a Grizzly Bear
In other words, 635,000 kilograms is 1,220 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 0.00082 times that amount.(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)
An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 521 kg. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).