Fig. 2

Class I and class II chord diagrams representing the fully resolved transtition matrix between host orders. Chord width between source and sink host state is proportional to the median transition rate per year. Dark gray chords are statistically supported (BF > 3.0). Colors correspond to host order: Anseriformes – red, Charadriiformes – green, domestic chickens – blue, Columbiformes – brown, other Galliformes – yellow, Psittaciformes – orange, Suliformes – purple