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eyes in the gaze following of great apes and human infants: the cooperative eye hypothesis” (英語). Journal of Human Evolution. pp. 314–320. doi:10.1016/j
eyes in the gaze following of great apes and human infants: the cooperative eye hypothesis" http://www.chrisknight.co.uk/wp-content/uploads/2008/06/eyes-cooperation
eyes in the gaze following of great apes and human infants: the cooperative eye hypothesis” (英語). Journal of Human Evolution. pp. 314–320. doi:10.1016/j
and cooperative breeding in Harris' Hawks." The Auk 393-404. ^ Bednarz, J. C., & Ligon, J. D. (1988). "A study of the ecological bases of cooperative breeding
Kobe; Dewitte, Siegfried (2006-01-01). “Second to fourth digit ratio and cooperative behavior”. Biological Psychology 71 (1): 111–115. doi:10.1016/j.biopsycho