Least grebe

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Least grebe
Least grebe.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Podicipediformes
Family: Podicipedidae
Genus: Tachybaptus
Species:
T. dominicus
Binomial name
Tachybaptus dominicus
(Linnaeus, 1766)
Least Grebe.png
Range of T. dominicus
Subspecies separated by black lines
Synonyms

Colymbus dominicusLinnaeus, 1766

The least grebe (Tachybaptus dominicus), an aquatic bird, is the smallest member of the grebe family. It occurs in the New World from the southwestern United States and Mexico to Argentina, and also on Trinidad and Tobago, the Bahamas and the Greater Antilles.

Contents

Description

Breeding plumage Least Grebe - breeding plumage.jpg
Breeding plumage

The least grebe ranges in length from 21–27 cm (8.3–10.6 in) (depending on the subspecies) and in weight from 112–180 g (4.0–6.3 oz). [2] Weights are variable based on region and subspecies, being smaller in Panama, where males weighed a mean of 129 g (4.6 oz) against the females 116 g (4.1 oz) and larger in the West Indies, where the sexes weigh a mean of 161 g (5.7 oz) and 133 g (4.7 oz), respectively. In Texas, size is intermediate at 139 g (4.9 oz) and 122 g (4.3 oz). Even in the largest races, the least grebe is still smaller and lighter than any other grebe species. [3] Like all grebes, its legs are set far back on its body and it cannot walk well, though it is an excellent swimmer and diver. Small and plump, with a fairly short, sharp-pointed beak and bright yellow eyes, it typically appears quite dark all over.

The breeding adult is brownish grey above with a darker blackish crown and throat. It has a brownish chest and pale underparts. It shows a white wing patch in flight. Non-breeding birds are paler with a whitish throat, and immatures are paler and greyer than adults. Unlike all other members of its genus, it lacks any chestnut coloring on its neck.

Taxonomy

There are five recognized subspecies of least grebe, separated principally by size and color. [4] [5]

Its genus name, Tachybaptus, is a combination of two Greek words—takhus meaning fast and baptos meaning diving, or sinking under. [6] The specific name dominicus refers to the Caribbean island of Hispaniola, which was formerly known as Santo Domingo. [6] As its English name suggests, the least grebe is overall the smallest member of the grebe family. It is the only member of its genus found in the New World; the four other members of the genus Tachybaptus reside in the Old World and Australasia.

Habitat and range

Least grebes are found in a wide variety of wetland habitats, including freshwater ponds, lakes, and marshes, slow-flowing streams and rivers, roadside ditches, and mangrove swamps. [4] [7] In general, they prefer bodies of water with significant amounts of vegetative cover, particularly along the edges; they will even use wetlands which are almost completely overgrown. [4] They may choose small, temporary bodies of water to breed, in an effort to avoid predation of their chicks by large fish. [8]

Behavior

For much of the year, least grebes are found singly or in pairs; however, when not breeding, they sometimes gather in flocks of 20 or more. [9]

Diet

The least grebe eats a variety of aquatic life, including small fish, crustaceans, frogs and aquatic insects. [10] Like all grebes, it pursues much of its prey under water. During active feeding bouts, it spends an average of 12.5 seconds beneath the surface on each dive, with surface pauses ranging from 2–24 seconds. [11]

Breeding

Least grebes breed throughout the year. [10] Those in the tropics tend to breed during the rainy season, while active nests have been found in every month of the year in Texas. [8] Each pair builds a compact floating nest of vegetation—typically a variety of aquatic weeds—which is anchored to rooted plants in still open water as deep as 1.5 m (4.9 ft). The female lays three to six white eggs, though the damp nest material soon stains them with brown. [10] Both adults incubate the eggs, which hatch after 21 days. The striped young are sometimes carried on the adult's back.

Voice

The breeding call has been likened to a horse whinnying.

Threats

The least grebe, while a species of least concern, experiences a number of predators, particularly early in life. Large fish species and turtles are reported to take young grebes, and bird-eating raptors, including the bat falcon and the golden eagle, have been observed taking adult birds. [8]

Related Research Articles

<span class="mw-page-title-main">Grebe</span> Order of birds

Grebes are aquatic diving birds in the order Podicipediformes. Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter. Most grebes fly, although some flightless species exist, most notably in stable lakes. The order contains a single family, the Podicipedidae, which includes 22 species in six extant genera.

<span class="mw-page-title-main">Great crested grebe</span> Species of bird

The great crested grebe is a member of the grebe family of water birds. The bird is characterised by its distinctive appearance, featuring striking black and white plumage, and elaborate courtship display that involve synchronised dances and displays.

<span class="mw-page-title-main">Red-necked grebe</span> Species of migratory aquatic bird

The red-necked grebe is a migratory aquatic bird found in the temperate regions of the northern hemisphere. Its wintering habitat is largely restricted to calm waters just beyond the waves around ocean coasts, although some birds may winter on large lakes. Grebes prefer shallow bodies of fresh water such as lakes, marshes or fish-ponds as breeding sites.

<span class="mw-page-title-main">Horned grebe</span> Species of bird

The horned grebe or Slavonian grebe is a relatively small waterbird in the family Podicipedidae. There are two known subspecies: P. a. auritus, which breeds in the Palearctic, and P. a. cornutus, which breeds in North America. The Eurasian subspecies is distributed over most of northern Europe and the Palearctic, breeding from Greenland to western China. The North American subspecies spans most of Canada and some of the United States. The species got its name from large patches of yellowish feathers located behind the eyes, called "horns", that the birds can raise and lower at will.

<span class="mw-page-title-main">Black-necked grebe</span> Water bird from parts of Africa, Eurasia, and the Americas.

The black-necked grebe or eared grebe is a member of the grebe family of water birds. It was described in 1831 by Christian Ludwig Brehm. There are currently three accepted subspecies, including the nominate subspecies. Its breeding plumage features a distinctive ochre-coloured plumage which extends behind its eye and over its ear coverts. The rest of the upper parts, including the head, neck, and breast, are coloured black to blackish brown. The flanks are tawny rufous to maroon-chestnut, and the abdomen is white. When in its non-breeding plumage, this bird has greyish-black upper parts, including the top of the head and a vertical stripe on the back of the neck. The flanks are also greyish-black. The rest of the body is a white or whitish colour. The juvenile has more brown in its darker areas. The subspecies californicus can be distinguished from the nominate by the former's usually longer bill. The other subspecies, P. n. gurneyi, can be differentiated by its greyer head and upper parts and by its smaller size. P. n. gurneyi can also be told apart by its lack of a non-breeding plumage. This species is present in parts of Africa, Eurasia, and the Americas.

<span class="mw-page-title-main">Pied-billed grebe</span> Species of bird

The pied-billed grebe is a species of the grebe family of water birds primarily found in ponds throughout the Americas.

<span class="mw-page-title-main">Little grebe</span> Species of bird

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<span class="mw-page-title-main">Yellow warbler</span> Species of bird

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<span class="mw-page-title-main">Chestnut woodpecker</span> Species of bird

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<span class="mw-page-title-main">Fork-tailed palm swift</span> Species of bird

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<span class="mw-page-title-main">Pantanal snipe</span> Species of bird

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<i>Tachybaptus</i> Genus of birds

Tachybaptus is a genus of small birds of the grebe family. The genus name means "quick diving": it is from Ancient Greek takhys "quick" and bapto "I dip". It has representatives over much of the world, including the tropics.

<span class="mw-page-title-main">Hoary-headed grebe</span> Species of bird

The hoary-headed grebe is a member of the grebe family. It breeds in southern parts of Australia; it winters throughout the island of Tasmania. The bird takes its name from the silvery-white streaking on its black head. It is common in Australia, with a population of about 500,000. Its habitat is similar to that of the Australasian grebe.

<span class="mw-page-title-main">Tropical screech owl</span> Species of owl

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<span class="mw-page-title-main">Lined quail-dove</span> Species of bird

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<span class="mw-page-title-main">Azure gallinule</span> Species of bird

The azure gallinule is a species of bird in subfamily Rallinae of family Rallidae, the rails, gallinules, and coots. It is found in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Trinidad and Tobago, and Venezuela.

References

Notes

  1. BirdLife International (2016). "Tachybaptus dominicus". IUCN Red List of Threatened Species . 2016: e.T22696571A93571402. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22696571A93571402.en . Retrieved 19 November 2021.
  2. Ogilvie & Rose 2003, p. 92
  3. CRC Handbook of Avian Body Masses, 2nd Edition by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN   978-1-4200-6444-5.
  4. 1 2 3 Ogilvie & Rose 2003, p. 32
  5. Gill, F.; Donsker, D., eds. (2014). "IOC World Bird List 4.2". IOC World Bird List. doi: 10.14344/IOC.ML.4.2 .
  6. 1 2 Ogilvie & Rose 2003, p. 98
  7. Howell, Steve N.G.; Webb, Sophie (1995). A Guide to the Birds of Mexico and Northern Central America. Oxford University Press. pp.  94–95. ISBN   978-0-19-854012-0.
  8. 1 2 3 Ogilvie & Rose 2003, p. 34
  9. Hilty, Steven L. (2003). Birds of Venezuela. London: Christopher Helm. pp. 185–186. ISBN   978-0-7136-6418-8.
  10. 1 2 3 Stiles, Gary; Skutch, Alexander (1989). A Guide to the Birds of Costa Rica. Ithaca, NY: Comstock Press. p. 68. ISBN   978-0-8014-2287-4.
  11. Jenni, Donald A. (April 1969). "Diving times of the Least Grebe and Masked Duck". The Auk. 86 (2): 355–356. doi: 10.2307/4083516 . JSTOR   4083516.

Bibliography