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.