I was watching a show the other night, possibly "NOVA" on the local National Public Television station. They had a whole bunch of mechanized realistic-looking critters! They were using them to better invade the populations of similar birds/animals to better study their habits and such. Had "camera eyes", possibly some audio receivers, with a life-like mechanized movement. Even "the natives" thought they were real.
It doesn't stop with pigeons.
Enjoy!
CBODY67