Fawns as in "deer children". When young, they lie down in fields a lot, and don't have the flight instict developed yet, so if they're in the field with the "parent" deer out getting food and the tractors / harvesters come by, it can be legitimately dangerous.
Besides deer protection and wildlife management in general, they're used in SAR and police - especially in mountainous or forest areas, it's just soooo much faster to send a quick-response team with thermal drones than to travel by foot or wait for a chopper to show up. Obviously in rough weather you still need a legit chopper, but for stuff like "find someone who didn't return from a hike/called for an emergency without knowing where he precisely is" they're just fine.
On the infrastructure side, you can use thermal drones in construction planning to detect if/where a building is losing heat, spot (beginning) defects in industrial installations and inspect if a power line is still working acceptably. DJI also pairs the thermal camera with a decent photo camera so you don't need to send up two drones for the job.
Is it? I believe the commercial application for drones with thermal cameras is fairly well establish at this point. You can spot a lot of things in buildings, transmission lines, etc.
I grew up on a farm in the nineties, and in my teens, I saw a roe deer fawn that went through a forage harvester.
Surprisingly enough, there was almost no blood, but every bone in the animal was broken. The load of silage that it ended up in had to be thrown out, the forage harvester itself, needed some light repairs, the harvest got delayed a few hours, and the whole thing was really depressing.
Luckily as far as I can remember it happened only once, and it was definitely something that we tried hard to avoid.
