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Figure S1. Comparison of residual bill surface area plotted against maximum monthly average potential evapotranspiration (2003-2011, www.cimis.water.ca.gov) and maximum monthly average high temperature (1981-2011) (Prism Climate Group 2011).

Table S1. Correlation matrix for covariates used in overall linear models (N = 1488).

Table S2. Correlation matrix for nonforced covariates used in island-restricted linear models (N = 461).

Table S3. Linear models describing bill surface area of California song sparrows as a function of geographic variables (SEX and DATE in all models), with log-likelihood, number of parameters (k), AICc values, and model weights.

Table S4. Linear models describing bill surface area of California song sparrows as a function of climatic variables (SEX and DATE in all models), with log-likelihood, number of parameters (k), AICc values, and model weights (w).

Table S5. Models describing size-corrected bill surface area of California song sparrows as a function of all geographic variables, SEX and DATE with climate variables added: log-likelihood, number of parameters (k), AICc values, and model weights (w) (N = 1488).

Table S6. Models describing bill surface area of California islands song sparrows as a function of climatic and geographic variables (controlled for sex and date effects), with log-likelihood, number of parameters (k), AICc values, and model weights (w).

Table S7. Betas of covariates used in complete geographic linear models (N = 1488).

Table S8. Model-averaged betas of covariates used in complete island linear models (N = 461).

Table S9. Betas of covariates used in complete climatic linear models (N = 1488).

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