Survey effectiveness at delivering abundance and presence estimates with increasing survey effort measured in camera trap days (number of camera traps × number of days of survey).

<p>a) Accumulation graph of number of individuals captured during surveys; b) probability of detecting at least one cheetah with increasing effort, keeping the number of camera stations constant; and c) probability of detecting at least one cheetah with increasing effort, keeping the survey duration constant. The vertical lines in b) and c) depict the number of camera trap days that result in 95% probability of detecting presence.