The choice tank used in measuring male attractiveness and female preference. Brown paper covered the side and back walls (bold line). Brown river sand covered the floor of tank. Scored glass separated (solid line) the five small compartments. Transparent glass (dotted line) separated the large and small compartments. Tank dimensions: 30 by 20 cm.
Hall et al. BMC Evolutionary Biology 2004 4:1 doi:10.1186/1471-2148-4-1