An octopus. In particular ... You can trace the mantle—the baglike structure that housed its gills, hearts, and other vital organs. Ah yes. That dark stain in the middle there—that’s ...

Instead, it holds organs like the animal’s three hearts, gills, and digestive system. The octopus’ digestive tract is pretty alien compared to ours. The Marine Detective explains that when an octopus’ ...

Instead, it holds organs like the animal’s three hearts, gills, and digestive system. The octopus’ digestive tract is pretty alien compared to ours. The Marine Detective explains that when an ...