They are certainly best in cooler conditions, and in the absence of direct sunlight. This affects how far into foliage you can see. Judging background is safer with thermal than NV systems, spotlights etc. I shoot quite a bit around stock when pesting and find a thermal invaluable for spotting targets, and seeing anything in the background, though knowing the lie of the land is important, such as hedges etc. I don't think that there is any single foolproof method for safe shooting, more a combination of factors that result in a shot being taken.
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