Why is this animal unusual?
It’s a close relative of the pill bug – just scaled up enormously. Scientists call this deep-sea gigantism: in the cold, dark depths, some animals grow far bigger than their shallow-water cousins.
Why does it look like that?
Fourteen legs, a segmented armour shell and big triangular eyes with thousands of lenses that shine when light hits them. When threatened, it can curl up, just like its tiny garden relatives.
Strangest biological feature
Its appetite control. A giant isopod can go years without a meal – and when food finally arrives, it eats until it can barely move.
Why is it strange?
One giant isopod at an aquarium in Japan refused all food for more than five years. Nobody knows why. It became a national celebrity.
Interesting behavioral facts
They’re the clean-up crew of the deep. In 2019 scientists dropped a dead alligator onto the seafloor in the Gulf of Mexico and filmed giant isopods tearing into it within a day.
Records held
One of the largest isopods on Earth. In 2025 a newly named cousin from Vietnam was called Bathynomus vaderi – because its head looks like Darth Vader’s helmet.
