It's about one-fifth as heavy as a Pig
In other words, the weight of a Pig is 5 times 50 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 one-fifth as heavy as a cubic meter of Snow
In other words, 50 kilograms is 0.220 times the weight of a cubic meter of Snow, and the weight of a cubic meter of Snow is 4.50 times that amount.(Freshly fallen, standard conditions; measurements taken in Norway, 1965-68)
One cubic meter of freshly fallen snow under standard conditions weighs an average of 230 kg. Assembled in 2008, the world record largest snowman was constructed of 5,900,000 kg of snow and stood 37.21 m (122.1 ft) tall.
It's about one-fourth as heavy as The Heart of a Blue Whale
In other words, 50 kilograms is 0.250 times the weight of The Heart of a Blue Whale, and the weight of The Heart of a Blue Whale is 4 times that amount.(Balaenoptera musculus) (adult)
(for a 2014 specimen)
The heart of a blue whale weighs about 200 kilograms. These hearts pump an estimated 7,100 L (1,875 gal) of blood through the whale's massive body.
It's about three-tenths as heavy as a Reindeer
In other words, 50 kilograms is 0.3020 times the weight of a Reindeer, and the weight of a Reindeer is 3.310 times that amount.(for Rangifer tarandus granti, adult, bull) (a.k.a. Caribou) ()Rangifer tarandus)
An adult, male reindeer weighs between 159 and 182 kg. Reindeer undertake a lengthy annual migration, with some herds traveling up to 5,000 km.
To all those observing, Merry Christmas from the Measure of Things.
It's about one-third as heavy as a Panda Bear
In other words, the weight of a Panda Bear is 3 times 50 kilograms.(a.k.a. Giant Panda, Ailuropoda melanoleuca)(Adult, male)
An adult, male Giant Panda weighs up to 150 kg. Despite having the digestive system of a carnivore, the panda eats only bamboo and must eat up to 6.4 kg of it per day to compensate for the limited energy the plant provides.
It's about three-fifths as heavy as a Kangaroo
In other words, 50 kilograms is 0.590 times the weight of a Kangaroo, and the weight of a Kangaroo is 1.70 times that amount.(for red kangaroo, Macropus rufus) (adult, male)
An adult, male red kangaroo weighs up to 85 kg. Fantastic jumpers, red kangaroos can leap horizontally 9 m (30 ft) and vertically 3 m (9 ft) in a single bound.
It's about seven-tenths as heavy as a Beer Keg
In other words, 50 kilograms is 0.68680 times the weight of a Beer Keg, and the weight of a Beer Keg is 1.4560 times that amount.(for US half-barrel, full keg; draft beer; including keg itself, stainless steel)
A typical, half-barrel beer keg weighs 72.80 kg when full. A keg of this size contains 15.5 gallons of beer, or the equivalent of 6.8 cases.