The Cornell Lab of Ornithology and the National Audubon Society launched the Great Backyard Bird Count in 1998. It’s a citizen-science project that collects data about wild birds.
In 2015 bird counters in over 100 countries counted 5,090 species of birds, submitted over 147,000 checklists.
Once you sign up and download your checklist, you tally the numbers and kinds of birds you see for at least 15 minutes on one or more days of the count — February 12-15.
You can count from any location, anywhere in the world, for as long as you wish.