Spying technology is getting more sophisticated. Drones as we know them are obsolete. Robots appearing as living creatures are becoming science fact. First, robotic birds, then robotic insects. They look like the real thing and behave the same. Robotic birds fly over enemy territories, take photos and send data to their commanders. They come-up closer and provide data beyond anything satellites may offer. Flies on the wall record conversations. Counter-intelligence measures spot the drones the moment they transmit data.
Intelligence tactics still improve: drones record data and return to base, to avoid detection of any radio signal they transmit. Robots join bird flocks on their way above enemy camps, then return via detour. This all makes drone interception virtually impossible, rivaling spying satellites in many respects.
Enemy troops take a drastic measure: shoot ANYTHING that moves (in air or on land) and is not human. This safety measure comes at a cost: Bird migration is disrupted, animals are shot for no apparent reason, and more insects die from laser guns than from pesticides.
The counter-intelligence measures take a toll on the environment. But, is it the inevitable outcome? Is the result really that bad? Will the battle go that far out of control? Building underground comes to mind, but the machinery and the piles of dirt which result disclose the clandestine activities. Underwater camps face challenges with different drones... What will save the animals?
Edit: the surveillance system kills only whatever comes close to a protected area, it does not operate outside its safety area