Problem-solving performance is correlated with reproductive success in a wild bird population

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Wild psychometrics: evidence for ‘general’ cognitive performance in wild New Zealand robins, Petroica longipes (2015, methodology): “Published by Els approach, animals are presented with a single task, such as pulling a lever to release a food reward (Cole et al., 2012), removing an obstruction from their nestbox entrance (Cauchard et al., 2013), or removing undesirable objects from a display bower (Keagy et al., 2009, 2011).”
Performance in cognitive and problem-solving tasks in male spotted bowerbirds does not correlate with mating success (2013, unknown): “To understand how selection pressures may be acting on cognitive traits, individual cognitive differences must be related to measures of fitness variation (Shumway 2008; Sol 2009; Morand-Ferron et al. 2011; Cole et al. 2012; Cauchard et al. 2013).”
Toward wild psychometrics: linking individual cognitive differences to fitness (2014, background): “2009, 2011), reproductive success (Cole et al. 2012; Cauchard et al. 2013), and competitive ability (Cole and Quinn 2012).”