Birds Active during the day

Great Black-backed Gull

Larus marinus

iNaturalist eBird Wikipedia

Meet the world's largest gull, a formidable North Atlantic predator with a wingspan that commands respect. Known for its charcoal-black back and piercing gaze, this is the undisputed heavyweight of the coastline.

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Quick Identification

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Size

Length: 64–79 cm (25–31 in); Wingspan: 1.5–1.7 m (4 ft 11 in – 5 ft 7 in); Weight: 0.75–2.3 kg (1.7–5.1 lb)

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Colors

Adults have a slate-black back and wings with white underparts; thick yellow bill with a red spot near the tip; distinct bubblegum-pink legs

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Key Features

Massive size, the largest gull in the world
Deep charcoal-black mantle and wings
Heavy, bulbous yellow bill with a red spot
Pale pink legs and feet

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 7-11 AM, 3-6 PM

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Season Year-round in most temperate areas; most active at breeding colonies May-July

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Diet Omnivorous apex predator and scavenger; eats fish, crustaceans, mollusks, eggs, other birds, small mammals, and human refuse.

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Habitat Coastal beaches, rocky cliffs, estuaries, salt marshes, and increasingly found in large inland reservoirs and landfills.

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Where Does the Great Black-backed Gull Live?

Native to the North Atlantic basin, the Great Black-backed Gull maintains a powerful presence along the northeastern coasts of North America and the shores of northern Europe. In the United States, their core range stretches from the rugged coastlines of Maine down through the Mid-Atlantic, while in Europe, they are common sights from the British Isles to the Scandinavian fjords. While primarily coastal, southern populations are often permanent residents, while northern birds may push further south or move to large inland lakes during the harshest winter months.

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9 Countries

12.5M km² Range

Least Concern Conservation

US United States CA Canada GB United Kingdom NO Norway Iceland FR France Ireland Denmark Greenland

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iNaturalist / Verified observation data

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Behavior

The Great Black-backed Gull is widely regarded as the 'King of the Atlantic Coast,' behaving more like a bird of prey than a typical scavenger. They are highly territorial and dominant, often bullying smaller gulls, crows, and even hawks away from food sources. Unlike many other gulls, they are formidable hunters that will actively kill and eat other seabirds, such as puffins and shearwaters, and are known for their 'kleptoparasitism'—the practice of stealing catches directly from the mouths of other birds.

In social settings, they are often solitary or found in small groups, though they congregate in larger numbers at rich feeding grounds like fishing docks or landfills. Around humans, they are remarkably bold and intelligent, quickly learning to associate specific sounds or locations with food. While they are comfortable in urban coastal environments, they maintain a certain aloofness compared to the more social Herring Gull, often watching from a high vantage point before swooping in to claim a meal.

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Camera Tips

To capture the Great Black-backed Gull, placement is everything. If you live near the coast or a large waterway, position your camera on a high, flat vantage point such as a deck railing, a flat rooftop, or a sturdy pier post. These gulls prefer to land on elevated spots where they have a 360-degree view of potential threats and food. Angle your camera slightly upward if placing it on the ground to capture their impressive wingspan as they land.

Using a lure can be very effective, but you must be strategic. Fresh fish scraps or a shallow bowl of water can attract them, but be aware that their size and aggression may drive away other backyard birds. Because they are large birds, set your camera's trigger sensitivity to 'Medium' to avoid missing them, and ensure your focal distance is set for at least 3 to 5 feet to accommodate their massive bodies and prevent blurry 'wing-smears' across the lens.

Daylight is your best friend with this species. Their white feathers can easily 'blow out' or overexpose in bright midday sun, so if your camera allows for exposure adjustment, dial it down slightly. Early morning or late afternoon light will better highlight the deep contrast between their snowy white heads and their charcoal-black backs. During winter, look for them inland near reservoirs; a camera placed near an ice-free patch of water is a guaranteed hotspot.

Similar Species

Species that look similar or are commonly confused with Great Black-backed Gull.

Lesser Black-backed Gull

Noticeably smaller with bright yellow legs, whereas the Great Black-backed has pink legs.

Slaty-backed Gull

A Pacific species with a slightly lighter grey back and more extensive dark markings on the wingtips.

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Frequently Asked Questions

They are primarily diurnal, meaning they are most active during daylight hours. You will see them most frequently during the morning and late afternoon as they forage for food, often following the tides or fishing boat schedules.

If you live near the coast, providing an elevated platform like a flat roof or a tall bird bath may attract them. While they are scavengers, it is best to avoid leaving out processed foods; fresh fish scraps are a more natural lure, though they may attract other predators like raccoons.

They are opportunistic carnivores. Their diet includes fish, crabs, and squid, but they are also known to hunt other birds like pigeons and ducks, steal food from other gulls, and scavenge for leftovers at docks and landfills.

They are increasingly common in coastal suburbs and towns near large bodies of water. You might find them perched on streetlights, rooftops, or near shopping centers where food waste is accessible.

Size and leg color are the best clues. The Great Black-backed Gull is much larger and has pink legs, whereas the Lesser Black-backed Gull is smaller (roughly Herring Gull sized) and has bright yellow legs.

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