Come identificare Common Swift

Per identificare correttamente Common Swift (Apus apus), 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

16-17 cm

Apertura alare

42-48 cm

Peso

35-56 g

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del piumaggio.

   Sooty brown to blackish-brown overall, with a distinctive pale, whitish throat patch that is often difficult to see at a distance. The plumage is uniformly dark, lacking any lighter underparts or rump patch.

2. 2

   Forma del becco

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

   Small, black, and triangular when closed, but capable of opening very wide to capture insects in flight.

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown to black

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Blackish-brown, very short and weak, with all four toes pointing forward (pamprodactyl) for clinging.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   Long, scythe-shaped wings, a short, forked tail (often appearing square or slightly notched in flight), and a uniformly dark plumage. Its flight is fast, powerful, and agile, characterized by rapid wing beats and long glides.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   Juveniles resemble adults but often have a slightly paler, more prominent throat patch and a fresher, darker plumage with a faint scaly appearance due to pale feather edgings, particularly on the wings and tail. The tail fork may also appear slightly deeper.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   No significant seasonal plumage changes. Plumage may appear slightly browner and more worn towards the end of the breeding season before the annual molt.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

   None; males and females are identical in plumage and size.

Segni di campo chiave

• Overall Plumage. Look for a uniformly dark, sooty brown to blackish-brown bird. No white rump or pale belly. The pale throat patch is often hard to see unless close.
• Wing Shape. Distinctive long, narrow, scythe-shaped wings. When gliding, the wings are held stiffly, often slightly bowed.
• Tail Shape. Short, forked tail, which often appears square or slightly notched in flight, especially when spread. Not deeply forked like a swallow's.
• Flight Style. Extremely fast, powerful, and agile flight with rapid wing beats and long, sweeping glides. Often seen in large, screaming flocks.
• Vocalization. Listen for the characteristic high-pitched, piercing 'scree-scree-scree' calls, especially around buildings in summer evenings.
• Behavior. Spends almost its entire life in the air. Only lands at its nest site. Never seen perched on wires or branches like swallows.

Esplora Common Swift