This gallery contains multiple pictures of several species that frequent the feeding area.
The picture is taken when they interrupt an infrared beam that crosses a contrived perch near the food.
The camera (Nikon Coolpix 8800) can be left unattended until the memory card is filled.
Pictures of this home-brew system are included. The next version will be much smaller and less ugly.
A different system, that detects the bird one-way through a telescope and that might work for nesting birds, is becoming the favorite device.
A vibration detector, based on a modified clap-on / clap-off switch, is being tested at the feeder.