It's about nine-tenths as heavy as an Elephant.
In other words, 389 slugs is 0.940 times the weight of an Elephant, and the weight of an Elephant is 1.10 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 typically weigh about 270 slugs
It's about nine-tenths as heavy as a Tyrannosaurus rex.
In other words, 389 slugs is 0.890 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 1.10 times that amount.(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-a-half times as heavy as a Hippopotamus.
In other words, 389 slugs is 1.510 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 0.6620 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 half as heavy as an Anchor of a Cruise Ship.
In other words, 389 slugs is 0.5020 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 1.990 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 774 slugs. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about two times as heavy as The Tongue of a Blue Whale.
In other words, 389 slugs is 2.10 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 0.480 times that amount.(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 two-and-a-half times as heavy as a Giraffe.
It's about two-and-a-half times as heavy as a Rhinoceros.
In other words, the weight of a Rhinoceros is 0.370 times 389 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.