Occurrences of the three types of worthless items (or combination of items) offered to P. mirabilis females. Males wrapped and offered: a prey leftover, a cotton ball, or a dried out flower head. Two males wrapped two of these items together (combination: a prey leftover plus flower head; and prey leftover plus cotton ball).
Albo et al. BMC Evolutionary Biology 2011 11:329 doi:10.1186/1471-2148-11-329