Sorry this is a question for a bit of advice about field methods but I couldnt find a section for this. Has anyone used audio moth to assess presence of wildlife at varying distances from roads and houses? I cant see any literature on it and its something I am trying to do there is one point I am stuck on. It is to assess primate presence and I will be putting them on the road, at 50 m, 100m, 300m and 600m from the road, the issue I have is that these primates can be heard around 200m away from the moth. So is there a way to know if they are close to the device (within 20-30m)? I have read about triangulation but I would need to catch them on 3 or more devices for this to work so I am looking for another solution. The only thing I can think is pointing the device up at the sky to reduce the detection distance, any thoughts?