It's about one-and-one-tenth times as heavy as a Giraffe
In other words, 31,000,000 grains is 1.0 times the weight of a Giraffe, and the weight of a Giraffe is 0.962 times that amount.(Giraffa camelopardalis reticulata) (adult, male, maximum of range)
An adult, male giraffe can weigh up to 29,800,000 grains. 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 as heavy as a Rhinoceros
In other words, 31,000,000 grains is 0.96 times the weight of a Rhinoceros, and the weight of a Rhinoceros is 1 times that amount.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 32,000,000 grains. 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-one-fifth times as heavy as a Car
In other words, 31,000,000 grains is 1.216 times the weight of a Car, and the weight of a Car is 0.8224 times that amount.(for 2009 Ford Taurus) (curb weight)
A 2009 Ford Taurus weighs 25,490,000 grains. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 5,957,000 grains.
It's about three-fourths as heavy as The Tongue of a Blue Whale
In other words, 31,000,000 grains is 0.74 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 1.4 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 42,000,000 grains. 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 half as heavy as a Hippopotamus
In other words, 31,000,000 grains is 0.53 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 1.9 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 58,000,000 grains. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
It's about three times as heavy as a Cow
In other words, 31,000,000 grains is 3 times the weight of a Cow, and the weight of a Cow is 0.33 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 10,000,000 grains. 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-third as heavy as an Elephant
In other words, 31,000,000 grains is 0.33 times the weight of an Elephant, and the weight of an Elephant is 3 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 94,000,000 grains. 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 62,000,000 grains