Table 1.

Best model explaining avian extinction risk as a function of breeding system (brood-parasitic species versus species with parental care) and covariables in families containing brood-parasitic species. Best models were run with 50 different phylogenies, and posterior means (pm), confidence interval (CI) and p-values were averaged over the 50 models with 50 different phylogenetic trees (see text for details). Extinction risk was classified from least concern (1) to critically endangered (5), so that a negative pm indicates decreasing extinction risk. Species with parental care and continental species were taken as references for the calculation of coefficients.

variable	pm	CI	pMCMC
breeding system	−1.558	[−2.822; −0.368]	0.007
habitat generalism	−0.343	[−0.588; −0.099]	0.005
insularity	0.985	[0.336; 1.646]	0.002
distribution range	−3.847 × 10−7	[−5.567 × 10−7; −2.154 × 10−7]	0.001