2. They have big eyes.
Aside from their ears, dumbo octopuses are also known for having bell-shaped heads and big eyes. In fact, the diameter of their eyes is about one third of the width of their head. (In comparison, the diameter of the eyes of a human adult are about 1/7 the width of their skull.)
In spite of their size, though, the eyes of a dumbo octopus can barely see, which isn’t really a problem. After all, what good is good eyesight when it’s dark? Instead, the dumbo octopus finds its way around mostly by feeling its surroundings through the suckers on its tentacles or sensing the water current using the strand-like structures around its suckers called cirri.