When I was a youngster I spent one summer/fall collecting mountain stone for stone masons to veneer houses. Every morning you would try and guess how long until you found your first copperhead. Maybe once a month you would have a whole day without one, but by 9:30am you usually had come across at least one. They were nocturnal but around 4am they would snuggle up under a rock on a forest floor that was still radiating heat from the day before. You’d better rocks get hot. And without a rain they are like batteries.but I do know that rocks can get hot
I've used the "Flir One for Android" for a few years now. I get mixed results and the battery dies quickly in the cold. I don't consider it essential to my small scale beekeeping, but it's interesting. I've posted a good number video and photos showing the results here:Has anyone had any experience using a Flir C2 camera for imaging winter hives?