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Figure S1. Tree regressions used to describe variation in song characteristics in little greenbuls (songtype I).

Figure S2. Tree regressions used to describe variation in song characteristics in little greenbuls (songtype II).

Figure S3. Tree regressions used to describe variation in song characteristics in little greenbuls (songtype III).

Figure S4. Tree regressions used to describe variation in song characteristics in little greenbuls (songtype IV).

Figure S5. Maximum variation explained and importance scores for each environmental variable used as input to describe songtype I characteristics in little greenbuls in Cameroon under random forest.

Figure S6. Maximum variation explained and importance scores for each environmental variable used as input to describe songtype II characteristics in little greenbuls in Cameroon under random forest.

Figure S7. Maximum variation explained and importance scores for each environmental variable used as input to describe songtype III characteristics in little greenbuls in Cameroon under random forest.

Figure S8. Maximum variation explained and importance scores for each environmental variable used as input to describe songtype IV characteristics in little greenbuls in Cameroon under random forest.

Table S1. Site names, habitat type and coordinates where little greenbul songs were recorded in Cameroon.

Table S2. Sampling sites, number of individuals from which recordings of songs were analyzed, and sampling dates.

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