There are computer programs that detect motion using regular computer
web cams. See http://www.logitech.com/en-us/903/7256 , but there is also
free software. The computer compares one frame with the next. If there
are big changes (more than moving leaves) the computer starts recording.
The problem is: will they steal the cameras and the computer? You would
also need a power source.
Jorg
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