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)
n Arabian riding horse (or similar breed) weighs between 380 and 450 kg. During races, horses must carry jockeys and their equipment, which in the Kentucky Derby, for example, can weigh up to 54.4 kg.
It's about nine-tenths as heavy as a Grand Piano.
In other words, the weight of a Grand Piano is 1.1 times 404 kilograms.(for Steinway & Sons, Model D Concert 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)
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)