dcsimg

Lifespan, longevity, and ageing

provided by AnAge articles
Maximum longevity: 12.9 years (wild) Observations: Considering the longevity of similar species, the maximum longevity of these animals could be significantly underestimated.
license
cc-by-3.0
copyright
Joao Pedro de Magalhaes
editor
de Magalhaes, J. P.
partner site
AnAge articles

Brief Summary

provided by EOL authors
The Boat-tailed Grackle (Quiscalus major) was not distinguished from the Great-tailed Grackle (Quiscalus mexicanus) until the 1970s, but the two forms overlap on the coasts of Texas and Louisiana without interbreeding. The Boat-tailed Grackle is generally more closely associated with water, such as marshes and beaches, although in Florida it may be found inland. These birds eat a range of foods, mainly taken from water, such as aquatic insects, snails, crayfish, crabs, tadpoles, frogs, and small fish, but also including terrestrial insects and the eggs and young of other birds. During some seasons, seeds and grains are an important component of the diet. Nesting is in colonies, generally near water. These birds are often very common within their range, which has extended northward along the Atlantic coast to Long Island (New York, U.S.A.) in recent decades. The distribution extends southward through peninsular Florida and west along the Gulf Coast to southeastern Texas. There is generally little movement between seasons, although a few northern breeders may move south in the fall. (Kaufman 1996; AOU 1998)
license
cc-by-3.0
original
visit source
partner site
EOL authors

Brief Summary

provided by EOL authors
The Boat-tailed Grackle (Quiscalus major), a large blackbird of the southeastern United States, was not distinguished from the Great-tailed Grackle (Quiscalus mexicanus) until the 1970s, but the two forms overlap on the coasts of Texas and Louisiana without interbreeding. The Boat-tailed Grackle is generally more closely associated with water, such as around marshes and beaches, although in Florida it may be found inland. These birds eat a range of foods, mainly taken from water, such as aquatic insects, snails, crayfish, crabs, tadpoles, frogs, and small fish, but also including terrestrial insects and the eggs and young of other birds. During some seasons, seeds and grains are an important component of the diet. Nesting is in colonies, generally near water. These birds are often very common within their range, which in recent decades has extended northward along the Atlantic coast to Long Island (New York, U.S.A.). The distribution extends southward through peninsular Florida and west along the Gulf Coast to southeastern Texas. There is generally little movement between seasons, although a few northern breeders may move south in the fall. The Boat-tailed Grackle is one of only about a dozen bird species that are endemic to the United States (i.e., found nowhere else in the world). (Kaufman 1996; AOU 1998)
license
cc-by-3.0
copyright
Leo Shapiro
original
visit source
partner site
EOL authors

Boat-tailed grackle

provided by wikipedia EN

The boat-tailed grackle (Quiscalus major) is a passerine bird of the family Icteridae found as a permanent resident on the coasts of the Southeastern United States.

Habitat

It is found in coastal saltwater marshes and, in Florida, also on inland waters. Boat-tailed grackles have established significant populations in several United States Gulf Coast cities and towns, where they can be found foraging in trash bins, dumpsters, and parking lots.

Breeding

The nest is a well-concealed cup in trees or shrubs near water; three to five eggs are laid.

Description

The male boat-tailed grackle is 37–43 cm (15–17 in) long and weighs 165–250 g (5.8–8.8 oz).[2] Adult males have entirely iridescent black plumage, a long dark bill, a pale yellowish or brown iris, and a long keel-shaped tail. The adult female is much smaller at 26–33 cm (10–13 in) long and a weight of 90–115 g (3.2–4.1 oz).[3] She is also distinguished by her shorter tail and tawny-brown coloration, which covers the body apart from the darker wings and tail. The wingspan in adult birds is 39–50 cm (15–20 in).[4] In standard measurements, this species measures 13–20 cm (5.1–7.9 in) along the wing bone, 11–20 cm (4.3–7.9 in) in tail length, 2–4.2 cm (0.79–1.65 in) along the culmen, and 3.6–5.8 cm (1.4–2.3 in) along the tarsus.[5] On average, the boat-tailed grackle weighs about 10% more than the closely related great-tailed grackle, although the male great-tailed grackle has an even longer tail.[5][6]

Young males are black but lack the adult's iridescence. Immature females are duller versions of the adult female and have blotches or spots on the breast. The eye color of the boat-tailed grackle varies with range. Gulf Coast and inland birds have dark eyes, whereas Atlantic birds have pale eyes.[7]

Taxonomy

The boat-tailed grackle was first described by French naturalist Louis Jean Pierre Vieillot in 1819. Its specific epithet major means "larger" in Latin. Despite its restricted range, there are four subspecies of the boat-tailed grackle, differing in size and iris color. The boat-tailed grackle was once considered the same species as the great-tailed grackle. The great-tailed species is generally quite similar of slightly smaller body size but has a longer tail and lacks this species' distinct domed head shape. The common grackle, with which the boat-tailed species often overlaps along the Atlantic coastline, is noticeably smaller and shorter-tailed, as well as lacking the domed head shape.

Diet

They forage on the ground, in shallow water, or in shrubs; they will steal food from other birds. They are omnivorous, eating insects, minnows, frogs, eggs, berries, seeds, grain, and even small birds.

Call

Its song is a harsh jeeb, and it has a variety of typically grackle-like chatters and squeaks.

Gallery

References

  1. ^ BirdLife International (2012). "Quiscalus major". IUCN Red List of Threatened Species. 2012. Retrieved 26 November 2013.old-form url
  2. ^ "FieldGuides: Species Detail". eNature. Archived from the original on 23 June 2013. Retrieved 5 March 2013.
  3. ^ Bancroft, G.T. (1984). "Growth and sexual dimorphism of the Boat-tailed Grackle" (PDF). Condor. 86 (4): 423–432. doi:10.2307/1366822. JSTOR 1366822.
  4. ^ "Boat-tailed Grackle". All About Birds. Cornell Lab of Ornithology. Retrieved 5 March 2013. "Boat-tailed Grackle, Life History, All About Birds – Cornell Lab of Ornithology". Allaboutbirds.org. Retrieved 2013-03-05.
  5. ^ a b Jaramillo, Alvaro; Burke, Peter (1999). New World Blackbirds: The Icterids. Christopher Helm Publishing. ISBN 978-0713643336.
  6. ^ Dunning Jr., John B., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN 978-0849342585.
  7. ^ "Grackles – Are you getting them right?". eBird.org.

 title=
license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN

Boat-tailed grackle: Brief Summary

provided by wikipedia EN

The boat-tailed grackle (Quiscalus major) is a passerine bird of the family Icteridae found as a permanent resident on the coasts of the Southeastern United States.

license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN