Come identificare Great Crested Grebe

Per identificare correttamente Great Crested Grebe (Podiceps cristatus), 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

46-51 cm (18-20 in)

Apertura alare

70-85 cm (28-33 in)

Peso

800-1400 g (1.8-3.1 lbs)

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del piumaggio.

   Adults in breeding plumage have a striking appearance: a white face and neck, black crown, and prominent chestnut-red and black ear tufts (frills) that can be erected. The back and upperparts are dark brown to blackish, while the underparts are silky white. Non-breeding plumage is duller, with reduced or absent ear tufts and a less defined black cap. Juveniles have distinctive black and white stripes on the head and neck.

2. 2

   Forma del becco

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

   Long, slender, pointed, and reddish-pink to orange-red, often with a darker culmen.

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Bright red.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Dark grey to blackish, set far back on the body, adapted for propulsion underwater.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   The most distinctive features are the double crest and rufous-black facial ruff during breeding season. Its long, elegant neck and upright posture on water are also characteristic.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   Young birds are easily identified by their striped heads and necks, resembling a 'zebra-striped' pattern, which fades as they mature.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   The most significant change is the development of the elaborate head crests and ruffs in breeding plumage, which are reduced or absent in non-breeding (winter) plumage. The facial coloration also becomes duller in winter.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

   Males and females are generally similar in plumage, though males can be slightly larger and have more prominent crests and ruffs during courtship.

Segni di campo chiave

• Size and Shape. Look for a large, slender-necked waterbird with an elegant profile. It sits low in the water.
• Head Plumage (Breeding). The most striking feature: a black double crest and prominent chestnut-red and black facial ruffs. White face and throat.
• Head Plumage (Non-breeding). Crests and ruffs are reduced or absent, but the overall white face and dark cap remain, though duller. Red eye is still visible.
• Bill. Long, pointed, reddish-pink to orange-red bill, often with a darker culmen.
• Juveniles. Distinctive black and white stripes on the head and neck, which are unmistakable.
• Behavior. Frequent diving for fish. Elaborate courtship displays involving synchronized movements and head-shaking. Often carries chicks on its back.
• Vocalization. Listen for the characteristic harsh, rattling 'krr-r-r-r' calls, especially during the breeding season.

Esplora Great Crested Grebe