European Herring Gull

Informazioni

The European Herring Gull (Larus argentatus) is a large, widespread gull species found across the Northern Hemisphere. It is a highly adaptable and opportunistic feeder, often associated with coastal environments but increasingly found inland, particularly in urban areas. Known for its distinctive calls and robust build, it is a familiar sight in many parts of its range.

Dimensioni e longevità

Lunghezza

55-67 cm

Apertura alare

138-150 cm

Peso

750-1600 g

Longevità

Up to 30 years in the wild, typically 10-15 years

Dieta

Omnivore, highly opportunistic. Diet includes fish, crustaceans, mollusks, insects, eggs and chicks of other birds, small mammals, carrion, offal, discarded human food, and berries.

Caratteristiche fisiche

Piumaggio

Adults have a pale grey back and upperwings, with black wingtips (primaries) featuring white 'mirrors' (spots). The head, neck, underparts, and tail are pure white. Juveniles are mottled brown with dark streaking, gradually acquiring adult plumage over 3-4 years.

Forma del becco

Strong, slightly hooked yellow bill with a prominent red spot on the lower mandible (gonys). Juveniles have a dark bill that gradually lightens.

Colore degli occhi

Pale yellow iris with a red orbital ring in adults. Juveniles have dark eyes.

Colore delle zampe

Pinkish-flesh in adults. Juveniles have pinkish-grey legs.

Caratteristiche distintive

Large size, pale grey mantle, black wingtips with white mirrors, yellow bill with red spot, pink legs. The red spot on the bill is a key feature for chick begging behavior.

Aspetto giovanile

First-year birds are entirely mottled brown with a dark bill and dark eyes. Second-year birds show a mix of brown and grey feathers, with some white on the head and underparts, and a paler bill base. Third-year birds are largely grey and white but retain some brown in the wings and tail, and the bill is still duller yellow with a less prominent red spot. Full adult plumage is achieved in the fourth year.

Cambiamenti stagionali

Adult plumage is largely consistent year-round. In non-breeding plumage (winter), adults may show some faint streaking on the head and nape, which is lost by the breeding season.

Dimorfismo sessuale

Males are generally slightly larger and heavier than females, but plumage is identical. This difference is often not discernible in the field.

Come identificare

1. 1

   Size and Shape

   Look for a large, robust gull with a powerful build and a strong, slightly hooked bill.

2. 2

   Mantle Color

   Note the pale grey color of the back and upperwings. This is a key distinction from darker-mantled gulls.

3. 3

   Wingtip Pattern

   Observe the black wingtips (primaries) with prominent white 'mirrors' (spots) on the outer two primaries. This pattern is characteristic.

4. 4

   Leg Color

   Check for pinkish-flesh colored legs in adults. This immediately rules out Yellow-legged and Lesser Black-backed Gulls.

5. 5

   Bill Color and Markings

   Identify the yellow bill with a distinct red spot on the lower mandible. Juveniles have dark bills that gradually lighten.

6. 6

   Vocalizations

   Listen for the loud, raucous 'long call' – a series of 'kyow' or 'gah' notes followed by a drawn-out 'kyaaaah'.

7. 7

   Juvenile Plumage

   In young birds, look for heavily mottled brown plumage, dark bill, and dark eyes. Note the gradual transition to adult plumage over several years.

Habitat e areale

Biomi

Coastal areas, estuaries, large inland lakes, rivers, agricultural land, urban environments, landfills.

Areale geografico

Widespread across the North Atlantic, including Europe, Scandinavia, Iceland, and parts of North America (where it is often considered a subspecies or closely related species, Larus smithsonianus). Its range extends from the Arctic to temperate zones.

Fascia altitudinale

Primarily sea level to low elevations, though can be found at higher altitudes when foraging inland.

Ambienti preferiti

Rocky coasts, sandy beaches, cliffs, islands, harbors, fishing ports, estuaries, agricultural fields, urban rooftops, and landfills.

Comportamento

Periodo di attività

Diurnal, primarily active during daylight hours. May forage at night under artificial light or during full moon.

Abitudini alimentari

Highly opportunistic and generalist feeder. Forages by scavenging, surface-feeding, plunging, and pirating food from other birds. Often seen following fishing boats, scavenging at landfills, or foraging in intertidal zones. Will also hunt small prey, raid nests, and consume berries.

Comportamento sociale

Highly social, especially outside the breeding season, forming large flocks at roosts and feeding sites. Breeds in colonies, often dense, sometimes mixed with other gull species.

Tipo di volo

Strong, direct flight with powerful wingbeats. Can soar effortlessly on updrafts. Often glides with wings held in a slight dihedral. Agile in flight, especially when maneuvering for food.

Migrazione

Partial migrant. Northern populations are migratory, moving south to ice-free coasts in winter. Southern populations are largely resident or undertake short-distance dispersal. Juveniles tend to disperse more widely than adults.

Territorialità

Highly territorial during the breeding season, defending nesting sites within colonies. Outside breeding, less territorial, but may defend immediate feeding areas.

Riproduzione

Stagione riproduttiva

Typically April to July, with egg-laying peaking in May.

Abitudini di nidificazione

Nests colonially on cliffs, rocky outcrops, islands, sand dunes, and increasingly on urban rooftops. The nest is a bulky scrape lined with vegetation (grass, seaweed, twigs) and sometimes debris. Both sexes participate in nest building.

Dimensione della covata

2-3 eggs, rarely 1 or 4.

Descrizione dell'uovo

Typically 2-3 eggs, olive-brown to greenish-blue, heavily blotched and spotted with dark brown or black. Average size is about 70 x 49 mm.

Periodo di incubazione

28-30 days, incubated by both parents.

Periodo di involo

35-40 days after hatching. Chicks are semi-precocial, leaving the nest scrape within a few days but remaining in the vicinity and dependent on parents for food.

Cure parentali

Both parents share incubation duties and care for the chicks, feeding them regurgitated food. Parental care continues for several weeks after fledging until the young are independent.

Dove trovarlo

Consigli sul campo

1. Observe Behavior. Watch their feeding habits; their opportunistic scavenging is a good indicator. They are often bold and accustomed to human presence.
2. Listen for Calls. Their loud and distinctive calls are often heard before the bird is seen, especially in coastal or urban areas.
3. Check for Age. Pay attention to plumage variations to determine age. Juvenile and immature birds can look quite different from adults.
4. Compare with other Gulls. In areas where multiple gull species coexist, carefully compare leg color, mantle shade, and wingtip patterns to differentiate them.

Specie simili

Fatti rapidi

Diet:

Omnivorous scavenger

Habitat:

Coasts, urban areas, inland waters

Sociality:

Highly social, colonial breeder

Distinguishing Mark:

Pink legs, yellow bill with red spot, pale grey mantle

Vocalization:

Loud, raucous 'long call'

Curiosità

• The red spot on the bill of adult Herring Gulls acts as a target for chicks, which peck at it to stimulate regurgitation of food by the parents.
• European Herring Gulls are highly intelligent and adaptable, learning to exploit new food sources and environments, including urban settings.
• Historically, the European Herring Gull was considered conspecific with the American Herring Gull (Larus smithsonianus), but they are now often treated as separate species due to genetic and morphological differences.
• They are known to drop hard-shelled prey, like mollusks, onto rocks from a height to break them open.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Charadriiformes

Famiglia

Laridae

Genere

Larus

Specie

Larus argentatus

Esplora European Herring Gull