Individual differences in facial configuration in Large-billed crows (Corvus macrorhynchos)
Individual differences in facial configuration in Large-billed crows (Corvus macrorhynchos)
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大嘴乌鸦（Corvus macrorhynchos）面部结构的个体差异
DOI：
10.1007/s10211-013-0156-2
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发表时间：
2014
期刊：
影响因子：
1.1
通讯作者：
Eiichi Izawa
中科院分区：
文献类型：
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作者：
Noriko Kondo;Eiichi Izawa
个体认知是群居动物的一种基本认知能力。个体识别的先决条件是可以用来区分其他同种个体的明显特征。对鸟类的研究表明，视觉信息，如颜色图案，用于个体识别。然而，在单色鸟类的情况下，彩色图案不能用来识别个体。因此，我们预计，面部特征的配置，如喙或眼睛的形状，可能具有足够的个性，以允许在此类物种中进行个体识别。在这项研究中，我们旨在阐明大嘴乌鸦(Corvus Macrorhynchos)面部形态的明显个体差异。具体来说，我们分析了16只乌鸦的头像。我们测量了每只鸟20张图片中的26个变量，然后进行主成分分析和判别函数分析。结果表明，面部轮廓的形状是独立的，但通过判别函数进行重新分类意味着它在性别之间没有明显的差异。这些结果表明，即使在没有任何明显的颜色图案的情况下，乌鸦也可以根据面部形态的个性来识别个体。
The recognition of individuals is a basic cognitive ability of social animals. A prerequisite for individual recognition is distinct characteristics that can be used to distinguish between other conspecific individuals. Studies of birds have shown that visual information, such as colour patterning, is used in individual recognition. However, in the case of monochromatic birds, colour patterning cannot be used to identify individuals. Therefore, we expected that the configuration of facial features, such as the shape of the bills or eyes, may have enough individuality to permit individual recognition in such species. In this study, we aimed to clarify visible individual differences in the facial configuration of large-billed crows (Corvus macrorhynchos). Specifically, we analysed the profile pictures of 16 crows. We measured 26 variables in 20 pictures of each bird and then performed principal component analysis and discriminant function analysis. The results showed that the configuration of the facial profiles was individually distinct, but re-classification by discriminant functions implied that it did not clearly differ between sexes. These results suggest that crows may be able to recognise individuals on the basis of the individuality of facial configuration, even in the absence of any conspicuous colour patterning.