I wouldn't write this off yet.
A flock of crows of good size (200 animals) could provide a perfect platform.
Given increased minaturization, each could have a small brain implant which contains:
(1) Neural manipulator
(2) Visual sensation decoder
(3) Two-way transmitter
The animals would be induced to move their "range" (area where they normally live) closer to target facilities.
Then, in the course of their wandering, each time an animal came near the target a remote computer would activate its transmitter, receive images, and compile them.