a weakly significant differencep = 0.033
While PERMANOVA indicates a weakly significant difference between MMR and LMR food feeders ( p = 0.033; Table S1 in Additional file 4 ), we made a post-hoc prediction that this trend was driven by the morphological separation of the Cacatuidae (all of whom are MMR or mixed food feeders) from the other Psittaciformes on PC3.