The evolving pattern of Ring-billed Gulls this year, "current year" (since Jan.1,2017). Red icons are reports within the last 30days (since today March10,2017). Of course some gap areas are because no birders visited there since the beginning of this year...
Click to enlarge this static image; press ESC key to return.
Or view the interactive eBird map...
and zoom-in to show red/blue points/icons sooner.