grallaria:
Herring, Herring X Lesser Black-backed, and Lesser Black-backed Gulls - Nantucket, Massachusetts - 29 December 2011
grallaria:
Kumlien's Gull with presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusets - 29 December 2011
grallaria:
Presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
grallaria:
Presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
grallaria:
Presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
grallaria:
Presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
grallaria:
Presumed hybrid Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
grallaria:
Presumed Herring X Lesser Black-backed Gull hybrid - Nantucket, Massachusetts - 29 December 2011
