It's about one-and-one-tenth times as heavy as a Hippopotamus.
In other words, 261 slugs is 1.02 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.980 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 257 slugs. 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 one-and-two-fifths times as heavy as The Tongue of a Blue Whale.
In other words, the weight of The Tongue of a Blue Whale is 0.710 times 261 slugs.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 190 slugs. 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 one-and-a-half times as heavy as a Giraffe.
It's about three-fifths as heavy as an Elephant.
In other words, 261 slugs is 0.630 times the weight of an Elephant, and the weight of an Elephant is 1.60 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 420 slugs. 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 weigh up to 6.20 slugs.
It's about three-fifths as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 1.70 times 261 slugs.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 440 slugs while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about one-and-four-fifths times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.560 times 261 slugs.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 140 slugs. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about two-and-a-half times as heavy as a Car.
In other words, 261 slugs is 2.3060 times the weight of a Car, and the weight of a Car is 0.43370 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 113.20 slugs. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 26.450 slugs.