どっかに「神」はいないかなー
Greenfield, P. M. (1991). Language, tools, and brain: The ontogeny and phylogeny of hierarchically organized sequential behavior. Behavioral and Brain Sciences, 14, 531-51
Herman LM, Richards DG, Wolz JP.1984. Comprehension of sentences by bottlenosed dolphins. Cognition 16(2):129-219.