Probabilities of detecting owls before and after broadcasting vocalizations along survey routes from 2003–2013 in three protected natural areas of El Salvador, in relation to the species whose calls were broadcast. Logistic regression coefficients were derived from a species richness model that combined all detected species (All Species), and from single-species occupancy models for Ferruginous Pygmy-Owls, Mottled Owls, and Spectacled Owls. Posterior probabilities are represented as medians (black dots) ± 90% credible intervals (vertical black bars), and credible intervals for pre-broadcast effect sizes are represented as two gray horizontal lines on each graph.