It's about as heavy as a Horse.
In other words, the weight of a Horse is 1 times 404 kilograms.(Equus ferus caballus) (Arabian, adult)
It's about nine-tenths as heavy as a Grand Piano.
It's about four-fifths as heavy as a Polar Bear.
In other words, 404 kilograms is 0.783 times the weight of a Polar Bear, and the weight of a Polar Bear is 1.28 times that amount.(Ursus maritimus) (adult, male)
It's about three-fourths as heavy as a Grizzly Bear.
In other words, 404 kilograms is 0.775 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 1.29 times that amount.(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)
It's about seven-tenths as heavy as The Heart of a Blue Whale.
In other words, the weight of The Heart of a Blue Whale is 1 times 404 kilograms.(Balaenoptera musculus) (adult)
It's about one-and-three-fifths times as heavy as a Pig.
In other words, the weight of a Pig is 0.63 times 404 kilograms.(Domestic pig, Sus scrofa domesticus, a.k.a. S. domesticus) (adult)
Domestic pigs weigh between 50 kg and 450 kg. 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 three-fifths as heavy as a Cow.
In other words, 404 kilograms is 0.59 times the weight of a Cow, and the weight of a Cow is 1.7 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 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.