Feeding behavior on the floor and on the walls A–C Astyanax surface fish search for and pick up food lying on the ground at a high angle from the horizontal. Cavefish fed at lower angles (Modified from Wilkens and Strecker 2017 and Schemmel 1980) D in the field, Mysid shrimp are one of the sources of food for Astyanax E Mysid shrimp at Toro cave. Notice that mysid shrimp are mostly found crawling on the walls (four are highlighted by arrows) and seldom on the ground F Astyanax cavefish tilt their dorsoventral axis when cruising parallel to a glass wall in a tank they are acclimatized to live in.