Identification of human individuals from different facial photograph and its memory retention period by a jungle crow (Corvus macrorhynchos)

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  • ハシブトガラス(Corvus macrorhynchos)による異なる顔写真からの同一人物の識別とその記憶保持期間
  • ハシブトガラス(Corvus macrorhynchos)ニ ヨル コトナル カオジャシン カラ ノ ドウ イチジンブツ ノ シキベツ ト ソノ キオク ホジ キカン

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Abstract

In order to investigate the ability of identification and the memory retention period for the human in jungle crows (Corvus macrorhynchos), wild-caught jungle crows (n=19) were tested to discriminate a correct human face from 4 facial photographs in the discrimination test consisted by some sessions of 20 trials. In experiment 1 which investigated the identification ability, the crows were tested to choose a correct man from the 4 facial photographs in 6 tasks which differ among the facial direction (i.e., front, 45°right, 90°right) and the wearing some accessories (i.e., hat, sunglass and mask). In the next experiment 2 which investigated the memory retention period for the human face, the 16 of 19 crows were assigned into three non-experimental periods (1, 3, 6 months) and were tested to choose a correct man from the 4 facial photographs as experiment 1 after each non-experimental period. In both experiments, when the population percentage of crows which chose the correct man in the first trial was significantly higher than the probability of the chance (25%) by binomial test, it was defined that crows could identify the correct mans' face. From the results of experiment 1, the crow could identify the correct mans' face from the 4 front face, and could also identify the correct face from the 4 front face worn the hat and sunglass. However, crow became impossible to identify the correct man when the facial direction changed or the face wore the hat, sunglass and mask at the same time. From the results of experiment 2, it was suggested that crow could remember the correct mans' face for 6 months.

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