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Lay SummaryMany birds sing with their mates, forming duets that could serve many functions. We found that duetting behavior varied between the 2 sexes and between the breeding and nonbreeding season. Both females and males answer their mate’s songs in both seasons to defend territories and maintain contact with each other. Males also answer their mate during the breeding season, possibly to guard their paternity. Thus duetting functions in both breeding and nonbreeding activities.

Duetting behavior varies with sex, season, and singing role in a tropical oriole (Icterus icterus)