Figure 2.

The predicted probability of nest wall construction considering values of absolute (a) body and (b) egg mass after the natural log-transformation. We also included two binary factors (i.e. passerine/non-passerine and ground nester/non-ground nester) in each of the models and tested their effects on nest wall construction across the bird phylogeny. The trends based on our model predictions are depicted by solid lines, while the observed data points are represented by dots in the graphs.