the barreleye fish

Even in a deep-sea world full of adaptations for seeing in near-total darkness, the barreleye fish (Macropinna microstoma) stands out as one of the most bizarre. Two small indentations where eyes might normally appear on a fish are actually the barreleye’s olfactory organs, and its eyes are two glowing green orbs behind its face that gaze up towards the top of its head.⁣