Why not use a trail camera? They do everything this device does but better, plus they have video and night vision. And you can buy one for $50 instead of $200.
Look for one designed to use external power. Lots of people have connected them to car batteries (there are projects on the web). The consumer ones tend to use PIR sensors to trigger short video recordings, which might be a problem if the camera is too far away. Birds tend to be well insulated and may not emit much IR. Maybe pro ones use doppler radar to trigger recordings? You might want to choose one based on how long it can be configured to record video after being triggered, 30 seconds for example may not be long enough for what you want to capture. This is not a normal use of a trail camera so figure out what your needs are and see if there is one that meets them.
