The full Federal list of prohibitions can be browed from this web page:http://ecfr.gpoacces...-....19&idno=36
Based on the CalGuns thread discussion, I would question the authority of the Feds to act on behalf of the wildlife. Isn't wildlife regarded as property of the STATE (even on Federal land within California) and, therefore protected according to the laws of the California Dept of Fish and Game? Also, in that thread, some have mentioned securing their trail cams with cables and lag bolts. THAT might fall under 'injuring' or 'defacing' trees prohibition. There is also a prohibition on 'abandoning personal property' and I could see that stretched to cover this even though that is clearly not the intent of the law. This will make an interesting bit of case law when someone sues the Fed for overreaching their authority. I wonder what would happen if a hunter actually tried to get a special permit or authorization.
They would probably require you to conduct an environmental impact study and specify exactly which tree in the forest you intend to attach the trail cam to.
The only concern I share with those Federales is their concern for the methods used by cartels growing dope in the backcountry.