Great-tailed Grackle

Informazioni

The Great-tailed Grackle, often referred to as 'Tordo' in Spanish-speaking regions, is a large, conspicuous passerine bird known for its iridescent black plumage, long tail, and distinctive vocalizations. It is a highly adaptable species that has expanded its range significantly in recent decades, thriving in human-modified landscapes.

Dimensioni e longevità

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)

Longevità

Typically 5-12 years in the wild, with records up to 15 years.

Dieta

Omnivore

Caratteristiche fisiche

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.

Forma del becco

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

Colore degli occhi

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

Colore delle zampe

Black

Caratteristiche distintive

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.

Aspetto giovanile

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.

Cambiamenti stagionali

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

Dimorfismo sessuale

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.

Come identificare

1. 1

   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.

2. 2

   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.

3. 3

   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).

4. 4

   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.

5. 5

   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.

Habitat e areale

Biomi

Urban areas, suburban parks, agricultural fields, open woodlands, riparian zones, coastal marshes, and grasslands.

Areale geografico

South-central United States (from California, Nevada, Utah, Colorado, Nebraska, Iowa, Illinois, Indiana, Ohio, and Florida south), throughout Mexico, Central America, and into northern South America (Colombia, Venezuela, Ecuador, Peru).

Fascia altitudinale

Sea level up to approximately 2,500 meters (8,200 feet), primarily in lowlands and foothills.

Ambienti preferiti

Highly adaptable, preferring open or semi-open habitats, especially those with scattered trees, water sources, and human development. Common in cities, towns, farms, and golf courses.

Comportamento

Periodo di attività

Diurnal, most active during daylight hours.

Abitudini alimentari

Highly opportunistic omnivores. They forage on the ground, in trees, and in shallow water. Diet includes insects (grasshoppers, beetles, grubs), spiders, small vertebrates (lizards, frogs, nestlings, eggs), crustaceans, fish, fruits, seeds, grains, and human refuse. They are known to steal food from other birds and even raid nests.

Comportamento sociale

Highly social, especially outside the breeding season, forming large communal roosts that can number in the thousands. During breeding, they often nest in colonies, sometimes mixed with other icterids. They are known for their bold and sometimes aggressive behavior.

Tipo di volo

Strong, direct flight with steady wingbeats. Males often fly with their long tails held in a distinctive V-shape. They can be quite agile in flight, especially when foraging or escaping predators.

Migrazione

Primarily resident throughout most of their range. Northern populations in the US may undertake short-distance migrations south for winter, but many remain year-round in urban areas where food is readily available.

Territorialità

Males defend small territories around their nests during the breeding season, often displaying aggressively to rivals. Communal roosts are not territorial.

Riproduzione

Stagione riproduttiva

Varies geographically, typically from March to July in the northern parts of its range, and year-round in tropical regions.

Abitudini di nidificazione

Nests are typically bulky, cup-shaped structures made of twigs, grasses, weeds, and mud, lined with finer materials. They are usually placed in trees or shrubs, often near water, and frequently in colonies. Nests can be found in urban settings, including utility poles and artificial structures.

Dimensione della covata

Typically 3-5 eggs, usually 3-4.

Descrizione dell'uovo

3-5 eggs, pale blue to greenish-blue, heavily marked with dark brown, black, or purple spots, streaks, and blotches, particularly at the larger end. Eggs measure approximately 29 x 21 mm.

Periodo di incubazione

13-14 days, primarily by the female.

Periodo di involo

12-15 days after hatching, young leave the nest.

Cure parentali

Female primarily incubates and broods. Both parents feed the nestlings, though the female does the majority of the early feeding. Males often guard the nest and help feed older nestlings.

Dove trovarlo

Consigli sul campo

1. Listen for their calls. Their loud and varied vocalizations are often the first indication of their presence. Learn to recognize their harsh 'check' calls and gurgling songs.
2. Observe their foraging behavior. They are often seen walking on the ground with a distinctive swagger, flipping leaves or probing for insects. They are quite bold and may approach human activity.
3. Look for communal roosts. At dusk, observe large flocks gathering in trees or on power lines before settling into a communal roost for the night. These can be spectacular to witness.
4. Check for eye color. If you are in an area where both Great-tailed and Boat-tailed Grackles might occur, pay close attention to eye color, as it can be a crucial distinguishing feature.

Specie simili

Fatti rapidi

Common Name:

Great-tailed Grackle (Tordo)

Scientific Name:

Quiscalus mexicanus

Family:

Icteridae (New World Blackbirds)

Diet:

Omnivore

Conservation Status:

Least Concern

Key Feature (Male):

Long, keel-shaped iridescent black tail

Key Feature (Female):

Smaller, duller brown/black, shorter tail

Habitat:

Open and semi-open areas, urban, suburban, agricultural

Curiosità

• The Great-tailed Grackle has undergone one of the most dramatic range expansions of any North American bird in the last century, moving north from Mexico into the central and western United States.
• Males use their impressive tails in elaborate courtship displays, fanning them out and bowing to attract females.
• They are highly intelligent and adaptable birds, known for their problem-solving abilities, such as dropping hard-shelled food items onto pavement to break them open.
• Great-tailed Grackles are often considered a nuisance in urban areas due to their loud calls and large communal roosts, but they also play a role in insect control.
• Their scientific name 'Quiscalus mexicanus' refers to their origin in Mexico, and 'Quiscalus' is derived from a native word for a grackle-like bird.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Passeriformes

Famiglia

Icteridae

Genere

Quiscalus

Specie

Quiscalus mexicanus

Esplora Great-tailed Grackle