Figure 1.

Historical extinction periods for New Zealand birds. This diagram shows the families identified as suffering a higher number of extinctions in each period than expected, and traits that showed significant correlation with extinction risk in over 80% of phylogenies (see electronic supplementary material, table S4 and figures S1 and S2 for details). In the pre-human (E₁) and post-Polynesian (E₂) periods, the only life-history variables analysed were body size, flightlessness and sexual size dimorphism. Habitat variables and diet preferences were not analysed for E₁ and E₂.