Sampling
We conducted verbal interviews of 791 people [21]. All interviewees were ≥ 18 years of age and resided in one of 34 villages within 10 km of one of the seven targeted protected areas. These villages varied in size (~100-400 households) but all were rural, with the majority of households subsisting on agriculture and cattle production. We systematically sampled villagers by including at least three villages bordering each protected area and by asking village headsmen to congregate members in the morning before work. To sample older adults and non-workers, we interviewed people who were at home in the afternoons. We tried our best to obtain an equal number of interviews from both male and female respondents. Each respondent was interviewed separately, and we talked to only one person from each household to ensure independence of data collected.