Annual apparent survival in relation to (a) tarsus length, (b) bill length, and (c) bill width for cliff swallows marked and recaptured in southwestern Nebraska under variable annual weather conditions as measured by the Palmer Drought Severity Index (PDSI). A representative wet year (2007) had a PDSI of 4.18, a normal year (2005), 0.11, and a dry year (2006), −3.87. Survival estimates are from model 1 (Table 2). When projecting annual survival estimates for a particular trait size, all other covariates were held at their mean value. Dashed lines represent 95% confidence intervals calculated with the delta method using all sex-specific estimates from model 1 (Table 2).