BGBY. The concept is simple. You have 365 days to see as many bird species as you can identify in a certain area; a bike, your feet or public transportation your only means of locomotion. A Big Green Big Year. I will count as many bird species as I can within biking, walking or public bus distance from my house in Boulder, CO. The game begins at 12:00 am Jan 1, 2008 and ends at 11:59 pm Dec 31, 2008.