Functions of duetting in the tropical boubou, Laniarius aethiopicus: territorial defence and mutual mate guarding

By T. Grafe, Johannes H. Bitz. 2004

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Territory defence in tropical birds: are females as aggressive as males? (2005, background): “One key hypotheses is that duetting may represent a form of co-operative territorial defence between pair members (Wickler 1976, Wickler and Seibt 1980; Hall 2000; Grafe and Bitz 2004; but see Farabaugh 1982).”
Coordination between the sexes for territorial defence in a duetting fairy-wren (2008, unknown): “In duetting species, simulated intrusion elicits coordinated songs in the form of duets, and partners are often reported to approach the speaker together (Hall 2000; Grafe & Bitz 2004; Rogers et al. 2004; Mennill 2006; but see Rogers dy of Animal Behaviour.”
Duets defend mates in a suboscine passerine, the warbling antbird (Hypocnemis cantator) (2006, unknown): “Moreover, playback experiments in conjunction with temporary removals have shown that, in common with other avian duetters (e.g., tropical boubou; Grafe and Bitz, 2004), females readily perform duets with new and artificial partners (Seddon N, unpublished data); time-consuming investment is clearly ”