Cognitive abilities related to tool use in the woodpecker finch, Cactospiza pallida

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How wild bearded capuchin monkeys select stones and nuts to minimize the number of strikes per nut cracked (2010, background): “Tebbich & Bshary (2004) showed that woodpecker finches, Cactospiza pallida, selected sticks long enough to use as probes.”
Testing Problem Solving in Ravens: String-Pulling to Reach Food (2005, background): “…& Trinca 1989; Visalberghi & Limongelli 1994), chimpanzees Pan troglodytes (Povinelli et al. 2000), and woodpecker finches Cactospiza pallida (Tebbich et al. 2001; Tebbich & Bshary 2004), the behaviour involves much learning and is not necessarily initially because of causal understanding.”
Tool-related Cognition in New Caledonian Crows (2006, background): “In contrast, woodpecker finches did not spontaneously choose longer tools when food was further away (Tebbich & Bshary, 2004).”
Individual variation in spontaneous problem-solving performance among wild great tits (2011, background): “…that the large sample sizes needed for the study of individual variation are often difficult to obtain, especially for cognitive traits, the measurement of which commonly requires extensive subject training or repeated trials (e.g. Weir et al. 2002; Tebbich & Bshary 2004; Heinrich & Bugnyar 2005).”