Come identificare Willow Warbler

Per identificare correttamente Willow Warbler (Phylloscopus trochilus), 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

11-12.5 cm

Apertura alare

17-22 cm

Peso

6.5-12 g

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del piumaggio.

   Upperparts are olive-green to brownish-green, underparts are off-white to pale yellow, particularly on the flanks and vent. It has a distinct yellowish supercilium (eyebrow stripe) and a dark eye-stripe. The throat and breast are often washed with pale yellow, especially in fresh plumage. The rump is concolorous with the back.

2. 2

   Forma del becco

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

   Small, slender, pointed, and dark brown to blackish, with a paler base to the lower mandible.

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Legs are typically pale, ranging from light brown to yellowish-brown or even pinkish-brown. This is a key distinguishing feature from the Chiffchaff, which usually has dark legs.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   Longer primary projection (the length of the primary feathers beyond the tertials when the wing is folded) compared to the Chiffchaff, giving it a more 'pointed' wing appearance. Pale legs are a crucial field mark. Its overall appearance is often described as 'neater' or 'cleaner' than the Chiffchaff.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   Juveniles are generally brighter yellow on the underparts and supercilium, and their upperparts can be a more vibrant olive-green. Their plumage is softer and looser than adults.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   Plumage remains largely consistent throughout the year, though fresh autumn plumage can appear slightly brighter and more yellowish, with wear making spring birds appear duller and greyer-green.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

   Males and females are virtually identical in plumage. Males are typically slightly larger on average, but this is not discernible in the field.

Segni di campo chiave

• Song. The most reliable identification feature. Listen for the distinctive, melancholic, descending series of fluty notes that fades away.
• Leg Color. Observe the legs. Willow Warblers typically have pale, yellowish-brown to pinkish-brown legs, contrasting with the usually dark legs of the Chiffchaff.
• Primary Projection. When the bird is perched, look at the length of the primary feathers extending beyond the tertials. Willow Warblers have a noticeably longer primary projection, giving their wing a more pointed appearance compared to the shorter, blunter wing of the Chiffchaff.
• Supercilium. Note the yellowish supercilium (eyebrow stripe). It is usually quite distinct and extends further back than in the Chiffchaff.
• Plumage Tone. Overall, Willow Warblers tend to have a slightly brighter, cleaner olive-green upperparts and a more yellowish wash on the flanks and breast, especially when fresh.

Esplora Willow Warbler