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. 2008 Oct 29;3(10):e3499. doi: 10.1371/journal.pone.0003499

Figure 4. Observation enclosure used for female preference trials.

Figure 4

Solid walls extend into the female's quadrant between the two males to form visual barriers so that the female can only see the male in the quadrant she is in (diagonal grey dashed lines mark the line of sight).