This is an annual event, and the data collected is used by scientists studying bird migration and biology.

This is the web page that explains The Great Backyard Bird Count.

The Basics of The Great Backyard Bird Count

  • Count birds for at least 15 minutes on Feb 16, 17, 18, or 19, 2018
  • Keep track of how long you counted and how far you walked
  • Start a new count for each new place or day/time

Here's The Great Backyard Bird Count FAQ page.

If you want to contribute your data, you'll need a free ebird account (see the Register button on the top left, next to a small bird in flight icon), but you can also just create your own personal tracking post in this thread.

Frankly, I'm just going to track my birds here, and in my journal as usual, because the data entry is difficult if you're not fully sighted (binoculars do not work on web pages).

But the data is used by scientists in a lot of ways.