%2020.jpg)
The Great Black-backed Gull (Larus marinus), often referred to as the "king of the Atlantic waterfront," is the largest member of the gull family. This imposing bird is characterized by its white head, neck, and underparts, contrasting with its dark grey wings and back. The pink legs and yellow bill, with a hint of orange or red near the tip, complete its striking appearance.
Adults are easily identified by their sheer size, dark grey to blackish upper-wings, and white "mirrors" at the wing tips. The bill is robust and yellow, with a red spot near the tip of the lower mandible. Juveniles display a mottled black-brown pattern with a white tail featuring dark bars and spots at the base. They undergo a gradual transition to adult plumage over four years.
The Great Black-backed Gull frequents a variety of coastal environments, including rocky shores, sandy beaches, and estuaries. It is also found inland near lakes, ponds, rivers, and wet fields. This species is adaptable and can be seen at refuse dumps and dredge spoils, especially in New Jersey.
%2021.jpg)
Great black-backed gulls are opportunistic feeders, apex predators of the oceanic sky, and are very curious. They will investigate any small organism they encounter and will readily eat almost anything that they can swallow. They get much of their dietary energy from scavenging, with refuse, most provided directly by humans, locally constituting more than half of their diet. The proliferation of garbage or refuse dumps has become a major attractant to this and all other non-specialised gull species in its range. A study to investigate how much time they spend foraging at refuse dumps in Massachusetts found great black-backed gulls were only observed actively foraging 19% of their time there, eating less garbage than other common gulls, and spent most of their time roosting or loafing.
Like most gulls, great black-backed gulls regularly capture fish, and any fish smaller than themselves found close to the surface of the water are potential prey. Stomach contents of great black-backed gulls usually show fish to be the primary food. On Sable Island in Nova Scotia, 25% of the stomach contents consisted of fish, but 96% of the regurgitations given to young consisted of fish. Similarly, on Great Island in Newfoundland, 25% of the stomach contents were fish but 68% of regurgitants were fish.
