Birdsong and male—male competition: Causes and consequences of vocal variability in the collared dove (Streptopelia decaocto)

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Accuracy of song syntax learning and singing consistency signal early condition in zebra finches (2008, background): “Evidence for condition dependence of other song features is as yet scant or even controversial (Gil and Gahr 2002; ten Cate et al. 2002).”
The ability to perform physically challenging songs predicts age and size in male swamp sparrows, Melospiza georgiana (2009, background): “If low adult mass is indicative of early developmental stress (Boag 1987; Starck & Ricklefs 1998; Searcy et al. 2004), costs of vocal performance could be explained in a manner similar to the costs associated with song complexity in birds (Nowicki et al. 1998a; Searcy & Nowicki 2005).”
Male common loons, Gavia immer, communicate body mass and condition through dominant frequencies of territorial yodels (2007, background): “However, as a threat signal, the yodel also may reflect a male’s fighting ability and motivational state (Bradbury & Vehrencamp 1998; ten Cate et al. 2002).”
Sounds of male Lake Victoria cichlids vary within and between species and affect female mate preferences (2010, background): “A relation between size and sound frequency is known for other animals groups, such as birds (cf. ten Cate et al. 2002) and frogs (cf. Ryan 1991) and might be used by signal receivers to assess the quality of potential competitors or mates.”