Evaluating the Capability of Mirror Self-Recognition in Hooded Crows (Corvus cornix)статья
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Дата последнего поиска статьи во внешних источниках: 19 мая 2021 г.
Аннотация:A mark test allows us to assess if an animal can recognize its reflection in a mirror. The capability of self-recognition provides evidence of self-awareness, and it has been revealed only in a few animals with highly developed brains such as great apes, dolphins, elephants, magpies, and Clark’s nutcrackers. We investigated this capability in the hooded crow, another representative of corvids. Our experiment consisted of three stages: exposure to a mirror to examine its reflecting characteristics; a test (in front of the mirror, birds had a mark on the frontlets); and control (without mirror, birds had a mark on the frontlets). During the first sessions in front of the mirror, the crows, like other animals, revealed social behavior, pushing the mirror with the head and/or chest and pecking and scratching it with claws. These reactions almost ended in 2–3 sessions. None of the crows groomed the mark zone during the test (in front of the mirror, birds had a mark) more than in the control (without a mirror, birds had a mark). Therefore, none of the crows showed self-recognition. Four of six crows groomed the mark zone without a mirror for a longer time than in front of the mirror. This may be because crows felt the mark stuck to their feathers and they were more quiet and attentive to their senses without a mirror. Our findings suggest that the marking technique could be improved and crows need more time to examine mirror characteristics before the next test.