![]() ![]() In effect different songs add verisimilitude to the individuality of the singer.īeing a good Darwinian, Krebs suggests that having a large repertoire of songs has an evolutionary advantage, because it allows birds to defend larger territories than would otherwise be the case. Singing the same song from many locations within the territory would most likely be interpreted as a single bird moving about, but singing different songs from lots of locations would more likely be interpreted as coming from a number of different birds. ![]() He describes the use by an individual, usually male, bird of a variety of different songs as an attempt to increase the apparent density of occupation of a territory and so discourage the interest of rivals. In an attempt to explain this John Krebs suggested what he called the Beau Geste Hypothesis. ![]() Many species of birds have larger repertoires of songs than seems strictly necessary. ![]()
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