Come identificare Black-headed Gull

Per identificare correttamente Black-headed Gull (Larus ridibundus), controlla ciascuna di queste caratteristiche. Gli uccelli possono essere complicati da riconoscere, perché comportamento, habitat e canto spesso confermano ciò che una sola foto non può.

Dimensioni a colpo d'occhio

Lunghezza

35-39 cm

Apertura alare

81-98 cm

Peso

200-350 g

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del 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.

2. 2

   Forma del becco

   Forma e colore del becco, un segno di campo chiave.

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

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown with a white eye-ring.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Red in adults, yellowish-orange in juveniles.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   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.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   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.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   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.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

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

Segni di campo chiave

• Head Color (Breeding). Look for the distinctive chocolate-brown head (not black) during spring and summer. This is the most obvious field mark.
• 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.
• 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.
• 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.
• 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.
• Vocalizations. Listen for its characteristic 'laughing' calls, a series of raucous 'kwa-kwa-kwa' sounds.

Esplora Black-headed Gull