This Thayer's Gull -type bird
was at the Elliot Landfill, Corpus Christi, Texas on December
17 2004: note the very short wings( P10 < P9), dumpy body,
bull-neck with rounded head, rather short and thick bill, and
the marbling in the outer greater secondary coverts and the inner
primaries. While smaller than most HERGs, it was very aggressive,
dominating the nearby HERGs over food scraps:
