Yellow-legged Gull

Larus michahellis

Order: Charadriiformes / Family: Laridae

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yellow white gray large seabird urban coastal widespread common year-round colonial migratory

About the Yellow-legged Gull

The Yellow-legged Gull (Larus michahellis) is a notable member of the family Laridae, which comprises a wide array of gull species. This bird stands out due to its striking yellow legs, a feature that distinguishes it from similar species such as the Herring Gull. Native to the coastal regions of southern Europe, the Yellow-legged Gull has expanded its range significantly over recent decades. Its adaptability allows it to thrive in various environments, including urban areas where it often scavenges for food. While primarily a coastal bird, the Yellow-legged Gull is also found inland, particularly around large lakes and river systems. In the Mediterranean region, this gull is an integral part of the ecosystem, playing a crucial role in the food web as both a predator and a scavenger. During the breeding season, which occurs between March and July, it is found nesting on cliffs and islands, often in large colonies. The species has a significant presence in countries such as Spain, Italy, France, and Greece, where it contributes to the local biodiversity. Additionally, the Yellow-legged Gull is known for its migratory patterns, which see it moving to warmer coastal areas during the winter months. Its adaptability to different environments and food sources has led to an increase in its population, making it a common sight in many parts of its range. This gull's presence in various habitats, from the bustling cities of Europe to the serene Mediterranean coastlines, highlights its importance in both natural and human-altered landscapes. The Yellow-legged Gull's role in these ecosystems cannot be understated, as it helps control populations of smaller animals and contributes to nutrient cycling.

The Yellow-legged Gull belongs to the family Laridae, within the order Charadriiformes. These birds typically live average 10 years, max recorded 25 years.

How to Identify a Yellow-legged Gull

The Yellow-legged Gull is a large bird, measuring between 55 and 67 cm in length, with a wingspan of 130 to 158 cm. Adults are characterized by their white head and body, gray back and upper wings, and their signature bright yellow legs. The bill is strong and yellow with a red spot on the lower mandible, a feature common among large gulls. Juveniles differ significantly in appearance, displaying mottled brown plumage that gradually changes to adult coloration over four years. Males and females look alike, although males are typically slightly larger. The Yellow-legged Gull can be confused with the Herring Gull, but the latter has pink legs and a lighter gray back. In flight, the Yellow-legged Gull exhibits a powerful silhouette with broad wings and a strong, steady wingbeat. Its perching posture is upright and alert, often seen scanning its surroundings for food opportunities.

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Yellow-legged Gull Habitat and Range

Preferred Habitat

The Yellow-legged Gull inhabits a variety of coastal environments, including sandy beaches, rocky shorelines, and estuaries. It is also commonly found around large inland water bodies such as lakes and reservoirs. This gull is highly adaptable, often seen in urban areas where it exploits human refuse as a food source. It nests on cliffs, islands, and rooftops, particularly in cities. During the breeding season, it prefers remote islands or inaccessible cliffs to avoid predators. The species is prevalent from sea level to moderate elevations, with little seasonal habitat shift due to its adaptable nature.

Geographic Range

The Yellow-legged Gull primarily breeds in the Mediterranean basin, with significant populations in the Iberian Peninsula, Italy, Greece, and the Adriatic coast. During the non-breeding season, it disperses along the coasts of the North Atlantic, reaching as far north as the British Isles and occasionally southern Scandinavia. Populations also winter along the Atlantic coasts of France and the Iberian Peninsula. Migration corridors include coastal routes of Western Europe, where they are often sighted during seasonal movements. The species is considered abundant in its range, with high population densities particularly in the Mediterranean region.

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What Does the Yellow-legged Gull Eat?

The diet of the Yellow-legged Gull is diverse and opportunistic, comprising fish, marine invertebrates, small mammals, birds, and carrion. It also consumes human refuse, particularly in urban areas. During the breeding season, it feeds on a variety of prey, including crabs and other crustaceans found in coastal waters. The gull is known for its foraging technique of walking along the shore or flying low over the water to spot potential food. It often follows fishing boats, taking advantage of bycatch and fish discards. The size of its prey varies, but it typically targets food that can be swallowed whole or torn apart quickly.

Yellow-legged Gull Behavior and Social Structure

The Yellow-legged Gull is a social bird, often seen in large flocks, especially outside the breeding season. It exhibits territorial behavior during nesting, aggressively defending its site from intruders. Courtship displays involve head-tossing and mutual preening. This gull responds to predators with loud alarm calls and may mob intruders to protect its young. Its daily activity pattern includes foraging in the morning and late afternoon, with resting periods during midday. The bird's adaptability to human presence has led to an increase in urban populations, where it is often seen in parks and near water bodies.

Yellow-legged Gull Nesting and Reproduction

Yellow-legged Gulls build nests using vegetation, feathers, and other materials found in their environment. Nests are typically located on cliffs, islands, or rooftops in urban settings. The clutch size ranges from 2 to 3 eggs, which are olive-brown with dark spots. Incubation lasts about 27 to 31 days, with both parents sharing duties. The chicks fledge approximately 35 to 40 days after hatching. Parental care extends beyond fledging, with adults feeding and protecting the young. This species usually raises one brood per year, although some may attempt a second if conditions permit.

Yellow-legged Gull Sounds and Vocalizations

The Yellow-legged Gull's call is a series of loud, high-pitched 'kee-yah' notes, often repeated in rapid succession. These calls serve as contact and alarm signals within flocks. Their vocalizations can be quite raucous, especially in large colonies during the breeding season. Compared to other gulls, the Yellow-legged Gull's call is sharper and more piercing. At dawn, their calls are part of a chorus that fills the coastal air, contributing to the characteristic soundscape of their habitats.

Interesting Facts About the Yellow-legged Gull

1Yellow-legged Gulls can live for over 30 years, with some individuals reaching 35 years in the wild.
2The species was once considered a subspecies of the Herring Gull but is now recognized as a distinct species.
3Yellow-legged Gulls are known to follow plowing tractors to feed on unearthed invertebrates and small mammals.
4They are capable of drinking seawater, thanks to specialized glands that expel excess salt from their bodies.
5These gulls have been observed using tools, such as dropping shellfish from heights to crack them open.
6Urban populations of Yellow-legged Gulls have increased due to their ability to exploit human food resources.
7The species can be seen engaging in kleptoparasitism, stealing food from other birds, including other gulls.

Yellow-legged Gull Conservation Status

The Yellow-legged Gull is currently listed as Least Concern by the IUCN, with a population trend that is increasing. The primary threats include habitat loss and human disturbance, particularly in breeding areas. Conservation efforts focus on protecting nesting sites and managing urban populations to reduce human-wildlife conflicts. Historically, the species has expanded its range, adapting well to changes in its environment. Monitoring programs aim to ensure that populations remain stable and that any potential threats are promptly addressed.