Dawson Clary

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The traditional 'mark test' has shown some large-brained species are capable of mirror self-recognition. During this test a mark is inconspicuously placed on an animal's body where it can only be seen with the aid of a mirror. If the animal increases the number of actions directed to the mark region when presented with a mirror, the animal is presumed to(More)
Clark’s nutcrackers (Nucifraga columbiana), a non-social corvid, cache much of their food in order to survive periods of resource uncertainty. These caches are at risk as they are subject to pilferage from other animals including conspecifics. Potentially, nutcrackers can ensure the safety of these caches by keeping track of whether they have been observed(More)
Corvids and primates have been shown to possess similar cognitive adaptations, yet these animals are seldom tested using similar procedures. Object-choice tasks, which have commonly been used to test whether an animal is able to infer the mental state of a human experimenter based on a gestural cue, provide one potential means of testing these animals using(More)
Inhibition (i.e. the ability to restrain ineffective responses to a given stimulus) is a good indicator of complex cognitive abilities in animals. Inhibition has been demonstrated in a broad range of mammals with foraging style and social group size identified as potential influences of this ability. Whether these ecological factors also apply to birds has(More)
Corvids recognize when their caches are at risk of being stolen by others and have developed strategies to protect these caches from pilferage. For instance, Clark's nutcrackers will suppress the number of caches they make if being observed by a potential thief. However, cache protection has most often been studied using competitive contexts, so it is(More)
Cerebral lateralization is widespread amongst vertebrate species suggesting advantages are gained by having one of the brain's hemispheres exert dominant control over certain cognitive functions. A recently devised task for assessing lateralization of visuospatial attention by birds (Diekamp et al., 2005) has allowed researchers to suggest the corpus(More)
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