Dorsoventral axis when swimming by a wall A when swimming by a wall, cavefish from both Pachón and Tinaja caves incline the vertical axis of their body away from the wall. Eyeless surface fish enucleated as embryos, and surface fish in the dark do not incline as much their vertical axis and swim with a mostly vertical dorsoventral axis. Dotted line = standard deviation from average. Black star = eyeless. B When swimming vertically by the side of a wall, the detection field indicated by the semi-sphere on one side of the body can scan an area of the wall (Left; blue arrow). When tilted, a portion of the other side of the body’s receptive field or sensory space enlarges the total area of the wall that can be scanned (Blue + red arrow) C, D two Pachón cavefish swimming by a glass wall, with the distinct tilt of their dorsoventral axis.