Come identificare Great-tailed Grackle

Per identificare correttamente Great-tailed Grackle (Dives dives (posible)), 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

38-46 cm (15-18 in)

Apertura alare

48-58 cm (19-23 in)

Peso

Male: 160-267 g (5.6-9.4 oz), Female: 90-140 g (3.2-4.9 oz)

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del piumaggio.

   Adult males are entirely iridescent black, appearing purple-blue on the head and body, and greenish-blue on the wings and tail, depending on the light. Adult females are duller, with a dark brown to sooty black body, often with a paler brown throat and breast, and a shorter tail. Both sexes have dark eyes, though some populations exhibit pale yellow eyes.

2. 2

   Forma del becco

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

   Long, stout, conical, and sharply pointed, black in color.

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown to black in most populations, but some populations (especially in Mexico and Central America) have striking pale yellow eyes.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Black

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   Males have a remarkably long, keel-shaped tail, which they can fan out. The iridescent sheen on males is a key feature. Females are smaller with a proportionally shorter tail and duller plumage. The distinct eye color variation (dark vs. pale yellow) is also a notable feature depending on geographic location.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   Juveniles resemble adult females but are generally duller brown, often with streaking on the underparts and a less defined pale throat. Their eyes are typically dark brown, even in populations where adults have pale eyes.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   No significant seasonal plumage changes. The iridescent quality of the male's plumage can appear more vibrant in direct sunlight.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

   Pronounced. Males are significantly larger, have a much longer tail, and are entirely iridescent black. Females are smaller, duller brown/black, and have a shorter tail.

Segni di campo chiave

• Size and Tail. Look for a large, slender black bird. Males have an exceptionally long, keel-shaped tail that is often held in a V-shape during flight or display. Females are smaller with a shorter, but still noticeable, tail.
• Plumage Iridescence. In good light, observe the iridescent sheen on the male's black plumage, which can appear purple, blue, or green. Females are duller, dark brown to sooty black.
• Eye Color. Check eye color. While some populations have dark eyes, many Great-tailed Grackles (especially in Mexico and Central America) have striking pale yellow eyes, which is a strong field mark. This can help distinguish them from Boat-tailed Grackles (always dark-eyed) and Common Grackles (always pale-eyed).
• Vocalizations. Listen for their distinctive and varied calls, which include harsh 'check' notes, gurgles, whistles, and rusty-gate-like squeaks. Their vocalizations are often complex and loud.
• Habitat and Behavior. They are often found in open, human-modified environments like parks, parking lots, and agricultural fields. Look for them foraging on the ground, often in groups, or perched conspicuously on wires and tall structures.

Esplora Great-tailed Grackle