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Figure S1 Predicted trends in mean log10 body mass, averaged within latitudinal bands, with absolute latitude from linear models (a) within biomes and (b) comparing continental and island cells.

Figure S2 Global maps of the main environmental predictor variables: (a) mean annual temperature, (b) mean seasonality of NDVI and (c) inter-annual coefficient of variation in NDVI.

Figure S3 Proportional prevalence of different migratory behaviours (resident – dark grey; other – medium grey; migrant – light grey), categorized by body-size quartile and preference for tropical–subtropical (a) or temperate–polar (b) regions of the globe.

Table S1 Best-fit multivariate non-spatial ordinary least squares models of global patterns of avian body size in relation to environmental variables

Table S2 Spatial generalized least square regression results of linear and quadratic relationships between avian body size and key environmental variables across grid cell values

Table S3 Non-spatial ordinary least squares regression results of linear and quadratic relationships between avian body size and key environmental variables across grid cell values

Table S4 Significant relationships between median temperature of bird species ranges and body size within extant genera, families and orders containing more than four species

Table S5 Chi-squared tests for differences in migratory behaviour between bird species in (a) tropical–subtropical and (b) temperate–polar climates

Appendix S1. List of references for avian body sizes, organized by document type.

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ELE_1281_sm_fig s2.pdf2182KSupporting info item
ELE_1281_sm_fig s3.pdf5KSupporting info item
ELE_1281_sm_Appendix s1.doc112KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.