Put out a trail camera as well, pigs are creatures of habit and will often turn up at about the same time, the camera let's you turn up at the most opportune time. If spotlighting, a red led seems best, they don't get as skittery as with white light. Thermal or nv are brilliant but you have to weigh up the expense . I use a thermal imager and nv combo for pest control i started with the thermal and spotlight but animals quickly get light shy so added the nv, and it certainly is a big step up from just spotlighting.
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