i have used one for years in the bush, animals stand out like dogs balls even on a sunny day, daylight or dark it doesn't matter,(obviously they work better in darker situations) thermals pick up the heat off an animal.
Have a look at your cat or dog outside on the lawn with a thermal, they just stand out more than the surrounding vegetation.
It is a lot like looking for animals with binoculars, the more animals that you see, the better you get at finding them.
i have used them to find blood splatters and animals in the fern.
just another tool to help improve your chances.
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