Tricolored heron

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Tricolored heron
Tricolored Heron by Dan Pancamo.jpg
Egretta tricolor in Quintana, Texas
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Pelecaniformes
Family: Ardeidae
Genus: Egretta
Species:
E. tricolor
Binomial name
Egretta tricolor
(Müller, 1776)
Egretta tricolor map.svg
Range of E. tricolor
  Breeding range
  Year-round range
  Wintering range
Synonyms [2]
  • Ardea tricolorMüller, 1776
  • Hydranassa tricolor(Müller, 1776)
  • Hydranassa tricolor subsp. tricolorStotz et al., 1996

The tricolored heron (Egretta tricolor), formerly known as the Louisiana heron, [3] is a small species of heron native to coastal parts of the Americas. The species is more solitary than other species of heron in the Americas and eats a diet consisting mostly of small fish.

Contents

Habitat, breeding, and distribution

Tricolored herons breed in swamps and other coastal habitats and nests in colonies, often with other herons, usually on platforms of sticks in trees or shrubs. In each clutch, three to seven eggs are typically laid. The tricolored heron is the second most coastal heron in the United States. [3]

The species' range follows the northeastern United States, south along the coast, through the Gulf of Mexico and the Caribbean, to northern South America as far south as Brazil. In the Pacific region, it ranges from Peru to California, but it is only a nonbreeding visitor to the far north.

It was likely the most numerous heron in North America until the cattle egret arrived to the continent in the 1950s. [3] While the species' population appears to be on the decline, [3] it remains quite common. [4] The bird is listed as "Threatened" by the Florida Fish and Wildlife Conservation Commission. [5]

Description

This species measures from 56 to 76 cm (22 to 30 in) long and has a typical wingspan of 96 cm (38 in). [6] The slightly larger male heron weighs 415 g (14.6 oz) on average, while the female averages 334 g (11.8 oz). [7] It is a medium-large, long-legged, long-necked heron with a long, pointed, yellowish or greyish bill with a black tip. Its legs and feet are dark. The plumage of the triclolored heron changes dramatically from its juvenile form to its adult form. [5]

Adults have a blue-grey head, neck, back, and upper wings, with a white line along the neck. The belly is white. In breeding plumage, they have long, blue, filamentous plumes on their heads and necks, and buff ones on their backs. [4]

Behavior and diet

The tricolored heron is more solitary when foraging than other North American herons. When it forages for its prey, it is typically belly-deep in water, alone or at the edge of a mixed flock. [3] [4] Kent (1986) found that the diets of tricolored herons in Florida consisted of 99.7% fish and prawns. [8] While other members of Egretta may also eat crabs and opportunistically forage for terrestrial arthropods, the tricolored heron has been consistently observed to be almost exclusively piscivorous, primarily feeding on members of Poeciliidae. [9]

Related Research Articles

<span class="mw-page-title-main">Egret</span> Type of bird of the heron family

Egrets are herons, generally long-legged wading birds, that have white or buff plumage, developing fine plumes during the breeding season. Egrets are not a biologically distinct group from herons and have the same build.

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

The great blue heron is a large wading bird in the heron family Ardeidae, common near the shores of open water and in wetlands over most of North and Central America, as well as far northwestern South America, the Caribbean and the Galápagos Islands. It is a rare vagrant to coastal Spain, the Azores, and areas of far southern Europe. An all-white population found in south Florida and the Florida Keys is known as the great white heron. Debate exists about whether this represents a white color morph of the great blue heron, a subspecies of it, or an entirely separate species.

<span class="mw-page-title-main">Heron</span> Family of birds

The herons are long-legged, long-necked, freshwater and coastal birds in the family Ardeidae, with 72 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genera Botaurus and Ixobrychus are referred to as bitterns, and, together with the zigzag heron, or zigzag bittern, in the monotypic genus Zebrilus, form a monophyletic group within the Ardeidae. Egrets do not form a biologically distinct group from herons, and tend to be named differently because they are mainly white or have decorative plumes in breeding plumage. Herons, by evolutionary adaptation, have long beaks.

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

The great egret (Ardea alba), also known as the common egret, large egret, or great white egret or great white heron is a large, widely distributed egret. The four subspecies are found in Asia, Africa, the Americas, and southern Europe. Recently it is also spreading to more northern areas of Europe. Distributed across most of the tropical and warmer temperate regions of the world, it builds tree nests in colonies close to water.

<span class="mw-page-title-main">Green heron</span> Species of bird

The Green heron is a small heron of North and Central America. Butorides is from Middle English butor "bittern" and Ancient Greek -oides, "resembling", and virescens is Latin for "greenish".

<span class="mw-page-title-main">Snowy egret</span> Species of bird

The snowy egret is a small white heron. The genus name comes from Provençal French for the little egret, aigrette, which is a diminutive of aigron, 'heron'. The species name thula is the Araucano term for the black-necked swan, applied to this species in error by Chilean naturalist Juan Ignacio Molina in 1782.

<span class="mw-page-title-main">Cattle egret</span> Cosmopolitan species of heron

The cattle egret is a cosmopolitan species of heron found in the tropics, subtropics, and warm-temperate zones. It is the only member of the monotypic genus Bubulcus, although some authorities regard its two subspecies as full species, the western cattle egret and the eastern cattle egret. Despite the similarities in plumage to the egrets of the genus Egretta, it is more closely related to the herons of Ardea. Originally native to parts of Asia, Africa, and Europe, it has undergone a rapid expansion in its distribution and successfully colonised much of the rest of the world in the last century.

<span class="mw-page-title-main">Western reef heron</span> Species of bird

The western reef heron, also called the western reef egret, is a medium-sized heron found in southern Europe, Africa and parts of Asia. It has a mainly coastal distribution and occurs in several plumage forms: a slaty-grey plumage in which it can only be confused with the rather uncommon dark morph of the Little egret ; a white form which can look very similar to the little egret although the bill tends to be paler and larger and the black form with white throat E. g. gularis of West Africa. There are also differences in size, structure and foraging behaviour. There have been suggestions that the species hybridizes with the Little Egret, and based on this, some authors treat schistacea and gularis as subspecies of Egretta garzetta. Works that consider the Western Reef Heron as a valid species include the nominate gularis and schistacea as subspecies.

<span class="mw-page-title-main">Reddish egret</span> Species of bird

The reddish egret is a medium-sized heron that is a resident breeder in Central America, The Bahamas, the Caribbean, the Gulf Coast of the United States, and Mexico. The egret is known for its unusual foraging behavior compared to other herons as well as its association with mud flats, its habitat of choice.

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

The little blue heron is a small heron of the genus Egretta. It is a small, darkly colored heron with a two-toned bill. Juveniles are entirely white, bearing resemblance to the snowy egret. During the breeding season, adults develop different coloration on the head, legs, and feet.

<span class="mw-page-title-main">Roseate spoonbill</span> Species of bird

The roseate spoonbill is a gregarious wading bird of the ibis and spoonbill family, Threskiornithidae. It is a resident breeder in both South and North America. The roseate spoonbill's pink color is diet-derived, consisting of the carotenoid pigment canthaxanthin, like the American flamingo. Plume hunting in the eighteenth and nineteenth centuries almost drove the roseate spoonbill to extinction. However, in recent years, the range of the species has expanded.

<i>Egretta</i> Genus of birds

Egretta is a genus of medium-sized herons, mostly breeding in warmer climates.

<span class="mw-page-title-main">Western cattle egret</span> Species of bird

The western cattle egret is a species of heron found in the tropics, subtropics and warm temperate zones. Most taxonomic authorities lump this species and the eastern cattle egret together, but some separate them. Despite the similarities in plumage to the egrets of the genus Egretta, it is more closely related to the herons of Ardea. Originally native to parts of Asia, Africa and Europe, it has undergone a rapid expansion in its distribution and successfully colonised much of the rest of the world in the last century.

References

  1. BirdLife International (2016). "Egretta tricolor". IUCN Red List of Threatened Species . 2016: e.T22696931A93594077. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22696931A93594077.en . Retrieved 11 November 2021.
  2. "Egretta tricolor (Statius Muller, 1776)". Global Biodiversity Information Facility . Retrieved 25 March 2023.
  3. 1 2 3 4 5 Frederick, Peter C. (2020). Poole, A.F. (ed.). "Tricolored Heron (Egretta tricolor), version 1.0" . Birds of the World. Ithaca, New York: Cornell Lab of Ornithology. doi:10.2173/bow.triher.01.
  4. 1 2 3 "Tricolored Heron". Audubon. 2014-11-13. Retrieved 2022-12-31.
  5. 1 2 "The Tricolored Heron Has More Than Three Colors". Audubon Florida. 2019-07-15. Retrieved 2022-12-31.
  6. "Tricolored Heron". All About Birds. Cornell Lab of Ornithology.
  7. "Biological and Ecotoxicological Characteristics of Terrestrial Vertebrate Species Residing in Estuaries: Tricolored Heron". USGS.
  8. Kent, Donald M. (1986). "Behavior, Habitat Use, and Food of Three Egrets in a Marine Habitat". Colonial Waterbirds. 9 (1): 25–30.
  9. Miranda, Leopoldo; Collazo, Jaime A (1997). "Food Habits of 4 Species of Wading Birds (Ardeidae) in a Tropical Mangrove Swamp". Colonial Waterbirds. 20 (3): 413–418.

Further reading