Greetings All



Just a wee warning. When looking for Black-tailed Gulls, it is important to realize that a number of gull species can show black tails and white vent/rump.



I have seen a couple, presumably 3rd cycle, California Gulls look like this, and I have been startled by a couple near adult Western Gulls, wherein the only sign of immaturity was the black tail band and some dark on the bill.



Size and shape are quite important to note, as is mantle color, wingtip pattern, and (in adults and maybe 2nd year birds), eye color. Leg color might be helpful as well.



Though we've had two well-documented records this year, this Asian species is still incredibly rare on the west coast, and (oddly enough) nearly as rare on the east coast.



Best Wishes

Steven Mlodinow