Great Backyard Bird Count

http://www.birdsource.org/gbbc/howto.html

The Great Backyard Bird Count continues through Monday, February 20. The Great Backyard Bird Count is an annual creates a real-time snapshot of where the birds are across the continent. Anyone can participate.  It takes as little as 15 minutes on one day, or you can count for as long as you like each day of the event. It’s free, fun, and easy—and it helps the birds. 

http://www.birdsource.org/gbbc/howto.html