Black-headed Gull

Informazioni

The Black-headed Gull is a small to medium-sized gull, easily recognizable by its chocolate-brown (not black) head during the breeding season. It is a highly adaptable and widespread species, often found in both coastal and inland environments, including urban areas. Its distinctive calls and agile flight make it a common sight across much of Eurasia.

Dimensioni e longevità

Lunghezza

35-39 cm

Apertura alare

81-98 cm

Peso

200-350 g

Longevità

Typically 10-15 years in the wild, with records up to 30 years.

Dieta

Omnivore, highly opportunistic. Diet includes insects, worms, fish, carrion, seeds, berries, human refuse, and small rodents.

Caratteristiche fisiche

Piumaggio

Adult breeding plumage: White body, pale grey back and upperwings, chocolate-brown head, red bill, red legs. Adult non-breeding plumage: White head with a dark smudge behind the eye and a smaller dark spot in front of the eye, red bill with a dark tip, red legs. Juveniles: Mottled brown on back and wings, pale underparts, dark brown tail band, yellowish-orange bill with a dark tip, yellowish-orange legs.

Forma del becco

Slender and pointed, typically red in adults, yellowish-orange in juveniles.

Colore degli occhi

Dark brown with a white eye-ring.

Colore delle zampe

Red in adults, yellowish-orange in juveniles.

Caratteristiche distintive

In flight, adults show a prominent white leading edge to the primary feathers and black tips to the outer primaries. The chocolate-brown head in breeding plumage is a key identifier. The slender red bill and legs are also characteristic.

Aspetto giovanile

First-winter birds have a mottled brown back and upperwings, a distinct dark brown tail band, and a yellowish-orange bill with a dark tip. The head is white with a dark ear spot, similar to non-breeding adults but often with more extensive dark markings.

Cambiamenti stagionali

Dramatic change between breeding and non-breeding plumage. The distinctive chocolate-brown head is present from late winter to late summer (breeding plumage). In autumn and winter (non-breeding plumage), the head becomes white with a dark smudge behind the eye and a small dark spot in front of it.

Dimorfismo sessuale

Minimal; males and females are generally indistinguishable in plumage and size, though males may be slightly larger on average.

Come identificare

1. 1

   Head Color (Breeding)

   Look for the distinctive chocolate-brown head (not black) during spring and summer. This is the most obvious field mark.

2. 2

   Head Markings (Non-breeding)

   In autumn and winter, observe the white head with a dark smudge behind the eye and a smaller dark spot in front of the eye.

3. 3

   Bill and Leg Color

   Note the slender red bill and red legs in adults. Juveniles have yellowish-orange bills with a dark tip and yellowish-orange legs.

4. 4

   Wing Pattern in Flight

   In flight, look for the prominent white leading edge to the primary feathers and black tips on the outer primaries. The underwings are white.

5. 5

   Size and Build

   It's a relatively small to medium-sized gull, smaller than Herring Gulls but larger than Little Gulls. Its overall build is rather delicate.

6. 6

   Vocalizations

   Listen for its characteristic 'laughing' calls, a series of raucous 'kwa-kwa-kwa' sounds.

Habitat e areale

Biomi

Temperate, Boreal, Marine, Freshwater. Found in a wide range of open habitats.

Areale geografico

Widespread across Europe and Asia, extending to parts of North America (as a vagrant). Breeding range covers most of Europe and temperate Asia. Winters in southern Europe, North Africa, the Middle East, and southern Asia.

Fascia altitudinale

Sea level up to several hundred meters, particularly near freshwater bodies.

Ambienti preferiti

Coastal areas, estuaries, lakes, rivers, marshes, agricultural fields, urban parks, refuse dumps, and reservoirs. Often found in close proximity to human activity.

Comportamento

Periodo di attività

Diurnal, though may forage at night under artificial light or during full moon.

Abitudini alimentari

Highly opportunistic and adaptable. Forages by walking, wading, swimming, and aerial hawking. Often follows ploughs for invertebrates, scavenges at refuse tips, and takes handouts from humans. Also preys on small fish, insects, and occasionally eggs or chicks of other birds.

Comportamento sociale

Highly social, especially outside the breeding season. Forms large flocks for foraging, roosting, and migration. Breeds in dense colonies, often with thousands of pairs.

Tipo di volo

Graceful and agile flight with relatively shallow wing beats. Often hovers or glides. Can be seen soaring on thermals. Distinctive white leading edge to the primaries is visible in flight.

Migrazione

Partially migratory. Northern populations are largely migratory, moving south for the winter. Southern and western populations may be resident or undertake shorter movements. Migrates in large flocks, often along coastlines or river valleys.

Territorialità

Territorial during the breeding season, defending a small area around the nest within the colony. Less territorial outside the breeding season.

Riproduzione

Stagione riproduttiva

Typically April to July, varying geographically.

Abitudini di nidificazione

Nests in dense colonies, often on the ground in marshy areas, islands in lakes, or coastal dunes. Nests are typically shallow scrapes lined with vegetation (grass, reeds, seaweed). Both parents participate in nest building.

Dimensione della covata

2-3 eggs

Descrizione dell'uovo

Usually 2-3 eggs (occasionally 1 or 4). Eggs are olive-brown to pale blue-green, heavily blotched and spotted with dark brown or black. Size: approximately 50 x 35 mm.

Periodo di incubazione

23-26 days, incubated by both parents.

Periodo di involo

25-30 days after hatching. Young leave the nest shortly after hatching but remain dependent on parents for food.

Cure parentali

Both parents share incubation duties and care for the chicks, feeding them regurgitated food until they fledge and for a period thereafter.

Dove trovarlo

Consigli sul campo

1. Look for large flocks. Black-headed Gulls are highly social and often found in large groups, especially when foraging or roosting.
2. Observe feeding behavior. Watch for their varied feeding techniques, from walking and picking to aerial hawking or scavenging.
3. Listen for calls. Their distinctive 'laughing' calls are often heard before the birds are seen, especially in colonies or large gatherings.
4. Check seasonal plumage. Pay attention to the head coloration to determine if it's breeding (chocolate-brown) or non-breeding (white with dark smudges) plumage, which helps with identification and understanding their annual cycle.

Specie simili

Fatti rapidi

Common Name:

Black-headed Gull

Scientific Name:

Chroicocephalus ridibundus

Family:

Laridae

Conservation Status:

Least Concern

Diet:

Omnivore

Habitat:

Coastal, inland waters, agricultural, urban

Breeding Season:

April-July

Clutch Size:

2-3 eggs

Curiosità

• Despite its common name, the head of the Black-headed Gull is actually chocolate-brown, not black.
• It is one of the most common and widespread gull species in Europe and Asia, often seen in urban environments.
• Black-headed Gulls are known for their opportunistic feeding habits, readily adapting to human-provided food sources.
• They are highly migratory in northern parts of their range, undertaking long journeys to warmer wintering grounds.
• The species was formerly placed in the genus Larus, but recent phylogenetic studies have moved it to Chroicocephalus.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Charadriiformes

Famiglia

Laridae

Genere

Chroicocephalus

Specie

C. ridibundus

Esplora Black-headed Gull