first upup, they livive hidden n peru's amamazon rainfororest but have r recently enterered sociey andaead a hostile culture clash. man: what we don't know is maybe what other factors can be influencing this behavior. it could be some pressures in their teterritories. it could be some fights between some mashco piro groups. dan: men, women, and children.n. elaine: : correspondent dan collyns reports on p peru's