Great Black-backed Gull
Larus marinus

f6.7 @ 1/4000s, ISO:800, Nikon D3S w 500mm and 1.7X teleconverter

"Great Black-backed Gull," Wikipedia, the free encyclopedia. This is the largest gull in the world, noticeably outsizing a herring gull (Larus argentatus). Only a few other gulls, including Pallas's gull (Ichthyaetus ichthyaetus) and glaucous gull (Larus hyperboreus), come close to matching this species' size. It is 64–79 cm (25–31 in) long with a 1.5–1.7 m (4 ft 11 in–5 ft 7 in) wingspan and a body weight of 0.75–2.3 kg (1.7–5.1 lb). In a sample of 2009 adults from the North Atlantic, males were found to average 1,830 g (4.03 lb) and females were found to average 1,488 g (3.280 lb). Some adult gulls with access to fisheries in the North Sea can weigh up to roughly 2.5 kg (5.5 lb) and averaged 1.96 kg (4.3 lb). An exceptionally large glaucous gull was found to outweigh any known great black-backed gull, although usually that species is slightly smaller. The great black-backed gull is bulky and imposing in appearance with a large, powerful bill. The standard measurements are: the bill is 5.4 to 7.25 cm (2.13 to 2.85 in), the wing chord is 44.5 to 53 cm (17.5 to 20.9 in) and the tarsus is 6.6 to 8.8 cm (2.6 to 3.5 in).
Salt Pond, Falmouth, Massachusetts