Through Project FeederWatch, scientists are able to track the movements of birds and learn whether their numbers are increasing or decreasing.
FeederWatch has collected and organized data, by state, since 1988.
You can be part of this citizen-science by counting birds at your own feeder.
FeederWatch runs from mid-November to early April, and you can start any time during the watch season. Register on-line or via US mail.
There's a small fee to participate, which helps pay for materials.
Find more details at BirdNote.org
