Wearing tree bark cloth masks and skirts, dancers representing fish spirits are invited during the season of the peach palm harvest to drink the juice. it is a feast and ritual exchange: the host group offers the spirits large quantities of peach palm juice, smoked meat and fish, and shaman-blessed coca and snuff. the visitors are the costumed dancers impersonating animal spirits. people eat the meat and fish, animal spirits receive the fruits of peach palm, which are cultivated, harvested, and processed by humans. this exchange expresses the idea that people and animals depend on each other for survival and reproduction. vaupes basin, eastern colombia amazon, population: 600