Figure 5. Song perches of male Bermuda Vireos were higher (a) in the breeding season than in the non-breeding seasons, (b) among males with no nesting duties than among males with nesting duties during the breeding season, and (c) when males sang discrete songs versus rambling songs. Estimated marginal means and 95% confidence intervals derived from a generalized linear mixed model (see text for details) were back-transformed to the original scale and plotted for all three categories. Note that the full range of song perch heights are not shown in this figure.