Giant isopods look like pill bugs the size of a dinner plate. They’re armored, slow, and a bit alien - pale grey, with stalked eyes and seven pairs of legs, drifting along the cold dark seafloor between 200 and 2,000 meters down.
They’re real cousins of the little pill bugs you find under garden rocks, just enormously magnified by deep-sea evolution. Food is scarce at those depths, so giant isopods evolved an extreme talent: surviving without eating for very long periods.
The most famous case is from a Japanese aquarium, where one captive isopod refused all food for almost five full years before finally dying. Its body simply slowed its metabolism to a crawl. In the real ocean, isopods mostly scavenge whatever falls from above - dead fish, occasional whale falls - and patiently wait the rest of the time.
