Its not just football supporters who join together in a rousing chorus to celebrate a victory. Winning a fight also appears to put the tropical boubou, an African bird, in the mood for a song.
Research published in BMC Ecology describes a rare example of a context-specific birdsong and identifies the tropical boubou as the first bird species known to sing a victory duet.
The birds probably sing to deter other birds from intruding into their territory. According to the authors, "We were able to hear the male note of the victory display across two territories, further than notes of other duets. Also, it was typically sung from higher perches than other duets, making it more conspicuous."
Tropical boubous are monogamous birds. The male and female of a pair often sing duets, with each bird having a distinct part.
German researchers Ulmar Grafe and Johannes Bitz visited the Comoe National Park in Ivory Coast to find out how tropical boubous respond to their territory being invaded. The researchers broadcast recordings of four duets, which are often sung during contests over territory, to 18 different pairs of birds.
Sixteen of the tropical boubou pairs stood their ground, and 11 of these pairs sung the victory duet within 30 minutes of the researchers turning off their tape machine. The birds that flew off, presumably after losing; the battle, didnt sing a note for at least 30 minutes.
The victory duet was the first and only song that the birds sung within 30 minutes of the antagonistic encounter. The tropical boubous waited for at least 150 seconds of silence, to check that the invaders had gone, before they announced they were the winners.
"Analysis revealed that the presumptive victory display was sung significantly more often after than before or during playback of recordings," write the researchers.
Like other duets sung by male and female tropical boubous, the victory duet contained "highly synchronised tonal notes that were often repeated." However this song was longer than the other 12 songs in the tropical boubous repertoire, with the same motif being sung around 40 times on average.
Gemma Bradley | BioMed Central
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