Na a akụkọ e bipụtara na Proceedings of the National Academy of Sciences, Tanya Vacharkulksemsuk na Mahadum California, Berkeley, na-akọwa otú ya otu eji video footage si a na-agba mkpakọrịta nwoke na nwaanyị ihe omume na-egosi otú ma ndị ikom ma ndị inyom bụ ndị nakweere ọzọ "irutụrụ" nọrọ nwere mmekọ ịrịọ a na-elu ụbọchị.
