Because of an editorial error, the results of several correlation analyses were reported incorrectly on pages 1241 and 1243–1244 in  Wilson and Holberton (Auk 121:1238–1249). In each case in which the results of a correlation analysis were reported, the second r-value given should have been identified as the critical value for the analysis. In addition, each correlation analysis should have been identified as a two-tailed test, using an alpha value of 0.05 and the sample size for the appropriate group (values reported elsewhere in the manuscript).