It's about nine-tenths as heavy as a Cow.
In other words, 100 stones is 0.930 times the weight of a Cow, and the weight of a Cow is 1.10 times that amount.(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 110 stones. 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 one-and-one-fifth times as heavy as a Grizzly Bear.
In other words, 100 stones is 1.220 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 0.820 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 82 stones. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
It's about one-and-one-fourth times as heavy as a Polar Bear.
In other words, 100 stones is 1.230 times the weight of a Polar Bear, and the weight of a Polar Bear is 0.8130 times that amount.(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 81.30 stones. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.
It's about one-and-two-fifths times as heavy as a Grand Piano.
It's about one-and-a-half times as heavy as a Horse.
In other words, the weight of a Horse is 0.670 times 100 stones.(Equus ferus caballus) (Arabian, adult)
n Arabian riding horse (or similar breed) weighs between 66 stones. During races, horses must carry jockeys and their equipment, which in the Kentucky Derby, for example, can weigh up to 8.60 stones.
It's about two-and-a-half times as heavy as a Pig.
In other words, the weight of a Pig is 0.40 times 100 stones.(Domestic pig, Sus scrofa domesticus, a.k.a. S. domesticus) (adult)
Domestic pigs weigh between 39 stones. The titular character "Babe the pig" in the 1995 family film was played by 48 different American Yorkshire piglets due to the length of filming and the rate at which piglets reach adulthood.
It's about two-fifths as heavy as a Car.
In other words, 100 stones is 0.38440 times the weight of a Car, and the weight of a Car is 2.6010 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 260.10 stones. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 60.780 stones.