Regarding the Phylogeny of Tickle-Induced Laughter

TickledChimpanzee

{Ross, M.D. et al. (2009), 'Reconstructing the evolution of laughter in great apes and humans', Current Biology, 19, p. 1106-1111}

{Ross, M.D. et al. (2009), 'Reconstructing the evolution of laughter in great apes and humans', Current Biology, 19, p. 1106-1111}

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