Relative likelihood of species occurring in urban sites as a function of breeding habitat. Bars marked with different letters (a, b
c) differ significantly from one another (posthoc pairwise comparisons, P < 0.05). The value shown for each habitat category is the estimated intercept (estimated frequency of urban occurrence) from posthoc comparisons when that category is set as the reference level (see main text for statistical details). The Y-axis indicates the relative likelihood, rather than absolute probability, of becoming urbanized.