|Lesser Black-backed Gull (1st cycle). Cancun, Mexico. 27 Dec 2013.|
LBBG is steadily increasing throughout the Caribbean Sea. Whether these birds have a north-south migration route (presumably from northern North America) or a east-west migration route (presumably from southwest Europe and northwest Africa) remains to be seen. Perhaps it's a combination of both?
Another interesting observation that I made on this trip was the ratio of 1st cycle Laughing Gulls to adult-types. It seemed that there were perhaps 3 first cycle Laughings for every adult-type:
|Laughing Gull (1st cycle). Cancun, Mexico. 29 Dec 2013. Limited Preformative molt.|
|Laughing Gull (1st cycle). Xcaret, Mexico. 29 Dec 2013. A rather extensive preformative molt, with mostly replaced upperwing coverts and tertials.|
|Laughing Gull (adult-type). Cancun, Mexico. 27 Dec 2013.|