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Although reports of animal tool‐use are phylogenetically widespread, it remains rare in the wild. From the perspective of human evolution, this rarity was first explained by the cognitive demands associated with tool use. Recently, an alternative assumption, “the tools are not often useful” hypothesis, proposes that tool use is rare, because it is seldom more useful than the species’ anatomical adaptations...
This study investigated whether the socially foraging yellow-crowned bishop (Euplectes afer afer) was able to learn a problem-solving task by observing a conspecific. In the test group, subjects observed a demonstrator opening a box before being exposed to the same task. Birds from the control group did not receive a social demonstration. Five out of six individuals from the test group succeeded in...
This study investigates problem solving in one northern ground hornbill (Bucorvus abyssinicus) and two southern ground-hornbills (Bucorvus leadbeateri) in a horizontal string-pulling task. In five conditions, two strings were stretched out on the ground and subjects had to pull the end of the string which was properly connected to an out-of-reach food reward. Two subjects succeeded above chance in...
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