ITHACA, N.Y. (AP) — The Great Backyard Bird Count, a citizen’s science project conducted across North America for four days each February, is expanding globally this year.

Anyone in the world with Internet access can participate in the 16th annual count Feb. 15-18. Participants watch birds at any location for at least 15 minutes, tally the numbers of each species, and report online at www.BirdCount.org .