Female birds sing much more often than previously thought. They do not simply mimic males and do not only defend territory. Their songs serve a different function, and scientists are just beginning to understand this.
Researchers studied Galapagos yellow warblers on Floreana Island. During the experiment, recordings of male, female, and duet songs were played in their natural habitat. The results contradicted previous assumptions.
Females did sing, but they did so not to compete with other females or to defend territory. Only a small number of females sang during the breeding season. Most songs were heard off-season, when females were not occupied with incubating and feeding chicks. Males sang year-round and with equal frequency in both seasons.
The most important observation concerned the form of singing. Females rarely sang alone. Their songs were more often heard in duets with a partner, and usually, the male was the initiator. Off-season, duets became even more frequent. This indicates that singing helps maintain the bond within the pair, rather than serving as a signal to outsiders.
Even when females actively defended territory, they sang less frequently. This breaks the link between song and aggression, which had been considered central to avian vocal communication for decades.
The study shows that science has long ignored female voices in the animal world. Now perceptions are changing. Female singing is not rare: it occurs in more than half of songbird species and is likely an ancient trait. Galapagos warblers demonstrate that song can be a tool for maintaining closeness rather than for competition. This changes not only the understanding of birds but also the approach to scientific questioning.
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