Table 2.

Summary of the two final models that investigated the effect of absolute brain volume, residual brain volume and trial number on the cylinder task performance for 10 bird species tested in this study and MacLean et al. [9].

predictoreffect ± s.e.p-valueχ2d.f.AIC
absolute brain volume (log)0.664 ± 0.107<0.00157.0121808.22
trial0.109 ± 0.022<0.001
residual brain volume (log)1.115 ± 0.4130.00727.9421837.28
trial0.107 ± 0.022<0.001