It's about one-two-hundred-thousandth as heavy as a Polar Bear.
In other words, 39 grains is 0.00000490 times the weight of a Polar Bear, and the weight of a Polar Bear is 204,000 times that amount.(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 7,960,000 grains. 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-two-hundred-thousandth as heavy as a Grizzly Bear.
In other words, 39 grains is 0.000004850 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 206,000 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 8,040,000 grains. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
It's about one-two-hundred-fifty-thousandth as heavy as a Cow.
In other words, the weight of a Cow is 270,000 times 39 grains.(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-six-hundred-fifty-thousandth as heavy as a Car.
In other words, 39 grains is 0.000001530 times the weight of a Car, and the weight of a Car is 653,600 times that amount.(for 2009 Ford Taurus; automatic transmission; 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 one-eight-hundred-fifty-thousandth as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 830,000 times 39 grains.(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-one-millionth as heavy as a Giraffe.
In other words, 39 grains is 0.000001000 times the weight of a Giraffe, and the weight of a Giraffe is 1,000,000 times that amount.(Giraffa camelopardalis reticulata) (adult, male)
An adult, male giraffe weighs an average of 39,000,000 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 0.0000010 times as heavy as The Tongue of a Blue Whale.
In other words, 39 grains is 0.000000940 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 1,100,000 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.