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Légende :
Nikolaas Tinbergen, A male Stickleback Lacking a Red Underside (N) and Crude Models of Male Sticklebacks with Red Undersides (R) (1951)  
Drawing from Nikolaas Tinbergen, The Study of Instinct, Oxford: Oxford University Press, 1951  
Contenu associé : “Je ne sçai quoi”