The Great Backyard Bird Count starts this Friday, Feb. 16th and goes through Monday, Feb. 19th.

"The Great Backyard Bird Count is an annual four-day event that engages bird watchers of all ages in counting birds to create a real-time snapshot of where the birds are across the continent. Anyone can participate, from beginning bird watchers to experts. It takes as little as 15 minutes. It’s free, fun, and easy—and it helps the birds."

More info here:

http://www.birdsource.org/gbbc/ [1]