Japanese eels can escape predators' stomach through their gills, finds studyJapanese eels can escape from dark sleeper fish by navigating back through the predator's digestive tract and out through its gills.
The Terrifying Way That Eels Escape a Hungry Fish's StomachJapanese eels possess a unique ability to escape from predatory fish by swimming back up the esophagus and exiting through the gills.