Only very expensive trailcams (USD 1,000+) are able to take photos of small and extremely fast stoats and weasels. So in order to monitor the presence/absence of weasel and stoat in a certain area, the Dutch working group for small Mustelids developed a combined camera-/tunnel System where cheaper trailcams (USD 300) successfully catch these small mammals.
If this monitoring system is to be used on a large scale, the price must be even lower that this. My thinking is, that in a setup as described in the combined camera/tunnel-system, a trailcam specialized in wildlife photography becomes obsolete. A cheaper camera, equipped with a photoelectric sensor and maybe an IR-flash would do the job as well.
How would such a solution look like? What camera-sensor combination can you recommend with a budget of about USD 100 – 150 for the final result?
PS: A “trailcam” in this context refers to a “camera trap” as described by wikipedia: [...] a remotely activated camera that is equipped with a motion sensor [...]. Camera trapping is a method for capturing wild animals on film when researchers are not present [...].