Song repertoire size in male song sparrows correlates with detour reaching, but not with other cognitive measures

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Performance in cognitive and problem-solving tasks in male spotted bowerbirds does not correlate with mating success (2013, unknown): “For example, in male song sparrows,Melospiza melodia, song repertoire correlated positively with performance in an inhibitory control task, but not with other cognitive measures (Boogert et al. 2011a).”
Problem-solving performance is correlated with reproductive success in a wild bird population (2013, background): “Only four recent studies provide evidence for an indirect link between mating success and problem-solving ability (but see Boogert et al. 2011b for a review of sexual selection acting on other cognitive abilities).”
The evolution of self-control (2014, background): “In song sparrows, a study using one of the tasks reported here found a correlation between self-control and song repertoire size, a predictor of fitness in this species (173).”