No, much simpler. Say, you are there and attract unwanted attention, but handling you in the usual way could be inconvenient [bad publicity and all that]. OK. So armies of pigeons will be homed in to relieve themselves on, and around, you during all the daylight hours. And how long will you last?
I say they will work for PLA, and you say they will work for Ministry of State Security.
We may be both proven to be right.:-)