here's abc's mariana van zeller with the latest installment of our series "into the wild." >> reporter: in this other-worldly darkness of the amazon the only thing one can be sure of is that you're being watched. all the sort of most dangerous creatures, the poisonous snakes, they all like to come out at night. look, a fish just jumped into the boat. we've put ourselves at the mercy of the untamed wilderness. whoo. in search of a fabled amazonian tree frog that has long been used by tribes here. we'll see how long it takes to find this frog. now in high demand thousands of miles away in the hills of los angeles, where ceremonies like this one have become the latest cleanse trend. here these people are poisoning themselves with the toxins from that frog. >> so just remember the breath is your guide. >> reporter: called kambo or sapo it's applied to burned skin and absorbed into the bloodstream. >> kambo is something very unknown. >> reporter: this process is not for the faint of heart. >> you have to have a sense of courage to come here. >> reporter: as you can hear. >> throwing up. the