AUTHORS CONTRIBUTIONS
S.O.G., S.A.M., T.C.O., and C.J.N designed the study. S.O.G carried out aviary experiments, while M.S.A., T.C.O., and C.J.N., supervised. S.O.G. and C.J.N. analysed data and interpreted results. S.O.G. developed the first draft of the manuscript. All authors read and approved the manuscript.