2.4.3 SCB Nest Success
To compare the structure of abandoned woodpecker cavities to natural cavities we used Welch’s tests for each set of measurements taken on all cavities encountered (Field et al., 2012). We then followed the same steps to create species specific logistic regression and model averages for the four SCB (Nemes, Jonasson, Genell, & Steineck, 2009; Field et al., 2012). Observations on the ATFL and the BCFL were combined given the similarity of their body metrics and life history traits, and hereafter are referred to as ATBC (Cardiff and Dittmann 2000). We used the same six cavity metrics, with the addition of whether the nest was located in an abandoned woodpecker cavity or a natural cavity (cavity type). As before, we used the R packages MuMIn andAICcmodavg to evaluate candidate models and average parameter coefficients per species.