Supporting Text (containing 5 additional figures) provides additional details concerning the methodology adopted (Section S1) and investigates <i>i)</i> the evolutionary dynamics in the limit cases when Nature only chooses <i>A</i> and <i>B</i> states (Sections S2 and S3); <i>ii)</i> the evolution of cheap forms of quorum depending on Nature’s state (Section S4); <i>iii)</i> the evolution of signaling strategies when individuals are constrained to achieve quorum solely in the presence of one particular (costly) signal (Section S5); and <i>iv)</i> the emergence of signaling in the evolutionary dynamics of <i>Cooperators</i> and <i>Loners</i> (Section S6).

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