Here is the link to the Christmas Bird Count google map.
Clicking on the link should load it into your Google Map app. It will stay in your map for a few minutes and then disappear after an unspecified timeout.
If you are logged into your Google account, you can do the following to save the map.
On your computer's web browser, open the map above, then look for the little greyed star symbol ☆, click that to add the map as a favorite in your Google account.
To find that saved map on your computer's web browser, select "Saved", then "Maps".
To find that saved map on your mobile app, select "You" at the bottom, then scroll down and look for "Maps".