Great Blue Heron
|Great Blue Heron|
|Great Blue Heron in Richardson Bay, California|
|Breeding range Year-round range Wintering range Present during migration|
The Great Blue Heron (Ardea herodias) is a large wading bird in the heron family Ardeidae, common near the shores of open water and in wetlands over most of North America and Central America as well as the Caribbean and the Galápagos Islands. It is a rare vagrant to Europe, with records from Spain, the Azores, England and the Netherlands. An all-white population found only in the Caribbean and southern Florida was once treated as a separate species and known as the Great White Heron.
The Great Blue Heron is replaced in the Old World by the very similar Grey Heron, which differs in being somewhat smaller (90–98 cm (35–39 in)), with a pale gray neck and legs, lacking the browner colors that Great Blue Heron has there. It forms a superspecies with this and also with the Cocoi Heron from South America, which differs in having more extensive black on the head, and a white breast and neck.
- Ardea herodias herodias Linnaeus, 1758. Most of North America, except as below.
- Ardea herodias fannini Chapman, 1901. The Pacific Northwest from southern Alaska south to Washington; coastal.
- Ardea herodias wardi Ridgway, 1882. Kansas and Oklahoma to northern Florida. Sightings in southeastern Georgia have occurred.
- Ardea herodias occidentalis Audubon, 1835. Southern Florida, Caribbean islands. Formerly known as a separate species, the Great White Heron.
- Ardea herodias cognata Bangs, 1903. Galápagos Islands.
It is the largest North American heron and, among all extant herons, it is surpassed only by the Goliath Heron and the White-bellied Heron. It has head-to-tail length of 91–137 cm (36–54 in), a wingspan of 167–201 cm (66–79 in), a height of 115–138 cm (45–54 in), and a weight of 2.1–3.6 kg (4.6–7.9 lb). Notable features include slaty flight feathers, red-brown thighs, and a paired red-brown and black stripe up the flanks; the neck is rusty-gray, with black and white streaking down the front; the head is paler, with a nearly white face, and a pair of black plumes running from just above the eye to the back of the head. The feathers on the lower neck are long and plume-like; it also has plumes on the lower back at the start of the breeding season. The bill is dull yellowish, becoming orange briefly at the start of the breeding season, and the lower legs gray, also becoming orangey at the start of the breeding season. Immature birds are duller in color, with a dull blackish-gray crown, and the flank pattern only weakly defined; they have no plumes, and the bill is dull gray-yellow. Among standard measurements, the wing chord is 43–49.2 cm (17–19.4 in), the tail is 15.2–19.5 cm (6.0–7.7 in), the culmen is 12.3–15.2 cm (4.8–6.0 in) and the tarsus is 15.7–21 cm (6.2–8.3 in).
The heron stride is around 22 cm (8.7 in), almost in a straight line. Two of the three front toes are generally closer together. In a track the front toes as well as the back often show the small talons.
The subspecies differ only slightly in size and plumage tone, with the exception of subspecies occidentalis, which as well as normal colored birds, also has a distinct white morph, known as the Great White Heron (not to be confused with the Great Egret, for which "Great White Heron" was once a common name). It is found only in south Florida and some parts of the Caribbean. The Great White Heron differs from other Great Blues in bill morphology, head plume length, and in having a total lack of pigment in its plumage. This is mainly found near salt water, and was long thought to be a separate species. Birds intermediate between the normal morph and the white morph are known as Würdemann's Heron; these birds resemble a "normal" Great Blue with a white head.
The call is a harsh croak. The heron is most vocal during the breeding season, but will call occasionally at any time of the year in territorial disputes or if disturbed.
Four calls of the Great Blue Heron
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. Nonvocal sounds include a loud bill snap, which males use to attract a female or to defend a nest site and which females use in response to bachelor males or within breeding pairs. The bill snap may be analogous the territorial song of passerines. Bill clappering, the rapid chattering of the tips of the bill, is very common between paired herons.
The "Great White Heron" could be confused with Great Egret but is larger, with yellow legs as opposed to the Great Egret's black legs. The Reddish Egret and Little Blue Heron could be mistaken for the Great Blue Heron, but are much smaller, and lack white on the head and yellow in the bill. In the southern reaches of its range, the Great Blue sometimes overlaps in range with the closely related and similarly sized Cocoi Heron. The Cocoi is distinguished by a striking white neck and solid black crown, but the duller juveniles are more easily confused. More superficially similar is the slightly smaller Grey Heron, which may sometimes vagrate to the Northern coasts of North America. The Grey (which occupies the same ecological niche in Eurasia as the Great Blue Heron) has very similar plumage but has a solidly soft-gray neck. Erroneously, the Great Blue Heron is sometimes referred to as a "crane".
Distribution and habitat
The Great Blue Heron is found throughout most of North America, as far north as Alaska and the southern Canadian provinces. The range extends south through Florida, Mexico and the Caribbean to South America. Birds east of the Rocky Mountains in the northern part of their range are migratory and winter in Central America or northern South America. From the southern United States southwards, and on the Pacific coast, they are year-round residents. However their hardiness is such that individuals often remain through cold northern winters, as well.
The Great Blue Heron can adapt to almost any wetland habitat in its range. They may be found in numbers in fresh and saltwater marshes, mangrove swamps, flooded meadows, lake edges, or shorelines. They are quite adaptable and may be seen in heavily developed areas as long as they hold bodies of water bearing fish. Great Blue Herons rarely venture far from bodies of water but are occasionally seen flying over upland areas. They usually nest in trees or bushes near water's edge, often on island (which minimizes the potential for predation) or partially isolated spots.
The primary food for Great Blue Heron is small fish, though it is also known to opportunistically feed on a wide range of shrimp, crabs, aquatic insects, rodents and other small mammals, amphibians, reptiles, and small birds. Herons locate their food by sight and usually swallow it whole. Herons have been known to choke on prey that is too large. It is generally a solitary feeder. Individuals usually forage while standing in water but will also feed in fields or drop from the air, or a perch, into water. Mice are occasionally predated in upland areas far from the species typical aquatic environment. Occasionally loose feeding flocks form and may be beneficial since they are able to locate schools of fish more easily. As large wading birds, Great Blue Herons are capable of feeding in deeper waters and thus are able to harvest from niche areas not open to most other heron species.
Typically, the Great Blue Heron feeds in shallow waters, usually less than 50 cm (20 in) deep, or at the water's edge during both the night and the day, but especially around dawn and dusk. The most commonly employed hunting technique of the species is wading slowly with its long legs through shallow water and quickly spearing fish or frogs with its long, sharp bill. Although usually ponderous in movements, the Great Blue Heron is surprisingly adaptable in its fishing methods. Feeding behaviors variably have consisted of standing in one place, probing, pecking, walking at slow speeds, moving quickly, flying short distances and alighting, hovering over water and picking up prey, diving headfirst into the water, alighting on water feet-first, jumping from perches feet-first, and swimming or floating on the surface of the water.
This species usually breeds in colonies, in trees close to lakes or other wetlands. Usually colonies include only Great Blue Herons though sometimes they nest alongside other species of herons. These groups are called heronry (a more specific term than "rookery"). The size of these colonies may be large, ranging between 5–500 nests per colony, with an average of approximately 160 nests per colony. Heronry are usually relatively close, usually within 4 to 5 km (2.5 to 3.1 mi), to ideal feeding spots. Although nests are often reused for many years and herons are socially monogamous within a single breeding season, individuals usually choose new mates each year. Males arrive at colonies first and settle on nests, where they court females; most males choose a different nest each year.
Great Blue Herons build a bulky stick nest, and the female lays three to six pale blue eggs. One brood is raised each year. If the nest is abandoned or destroyed, the female may lay a replacement clutch. Reproduction is negatively affected by human disturbance, particularly during the beginning of nesting. Repeated human intrusion into nesting areas often results in nest failure, with abandonment of eggs or chicks.
Eggs are usually laid at 2 day intervals, incubated for around 27 days and hatch asynchronously over a period of several days. Eggs are usually about 63 mm by 46 mm and weigh about 70 grams. Males incubate for about 10.5 hours of each day while females usually incubate for the remainder of each day and the night, with eggs left without incubation for about 6 minutes of each hour. The first chick to hatch usually becomes more experienced in food handling and aggressive interactions with siblings, and so often grows more quickly than the other chicks. Predators of eggs and nestlings include turkey vultures, several corvids, hawks, bears and raccoons, the latter two also potential predators of adults. Adult herons, due to their size, have few natural predators, but can be taken by American Alligators, American Crocodiles, Bald Eagles, Golden Eagles and, less frequently, Great Horned Owls and Red-tailed Hawks. When predation on an adult or chick occurs at a breeding colony, the colony can be abandoned by the other birds, but this does not always occur.
Both parents feed the young at the nest by regurgitating food. Parent birds have been shown to consume up to four times as much food when they are feeding young chicks (about 4300 kJ/day) than when laying or incubating eggs (about 1200 kJ/day). After about 55 days at the northern edge of the range (Alberta) and 80 days at the southern edge of the range (California), young herons take their first flight. They will return to the nest to be fed for about another 3 weeks, following adults back from foraging grounds. Young herons are not as successful as adults, as strike rates are similar but capture rates about half that of adults during the first 2 months post-fledging.
John James Audubon illustrates the Great Blue Heron in Birds of America, Second Edition (published, London 1827–38) as Plate 161. The image was engraved and colored by Robert Havell's, London workshops. The original watercolor by Audubon was purchased by the New-York Historical Society where it remains to this day (January 2009).
Eating a Common Snapping Turtle (Chelydra serpentina) hatchling
- BirdLife International (2012). "Ardea herodias". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Linnaeus, C (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. (in Latin). Holmiae. (Laurentii Salvii). p. 105.
- del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1992). Handbook of the Birds of the World Vol. 1. Lynx Edicions, Barcelona ISBN 84-87334-10-5.
- del Hoyo, J; Elliot, A; Sargatal, J (1996). Handbook of the Birds of the World 3. Barcelona: Lynx Edicions. ISBN 84-87334-20-2.
- Cornell Lab of Ornithology
- Great Blue Herons, Great Blue Heron Pictures, Great Blue Heron Facts – National Geographic. Animals.nationalgeographic.com (2012-12-13). Retrieved on 2012-12-19.
- Sibley, D. (2000). The Sibley Guide to Birds. National Audubon Society ISBN 0-679-45122-6
- Dickinson, M. B. et al., eds. (1999). Field Guide to the Birds of North America. National Geographic ISBN 0-7922-7451-2.
- Blake, Emmett Reid (1977). Manual of Neotropical Birds, Volume 1. University Of Chicago Press, ISBN 978-0-226-05641-8
- Proceedings of the United States National Museum, Volume 42.
- Murie & Elbroch, Peterson Field Guide to Animal Tracks, pg. 334 (2005)
- Sibley, D. A. "Great White" Heron – not just a colour morph (retrieved 2009-01-24)
- Butler RW. The Great Blue Heron. In Birds of North America (ed: Poole and Gill), No. 25
- Short, Henry L. and Cooper, Robert J. (1985). Habitat suitability index models Great blue heron. Biological report 82(10.99). Washington, DC : Western Energy and Land Use Team, Division of Biological Services, Research and Development, Fish and Wildlife Service
- "Heron in UK, 3K miles off target. Thesun.co.uk (2007-12-11). Retrieved on 2012-12-19.
- "Hinterland Who's Who – Great Blue Heron". Canadian Wildlife Service. Retrieved 2007-11-23.
- Naumann, Robert. (2000-05-16) Animaldiversity.ummz.umich.edu. Animaldiversity.ummz.umich.edu. Retrieved on 2012-12-19.
|Wikimedia Commons has media related to Ardea herodias.|
|Wikispecies has information related to: Ardea herodias|
- Audubon's Great Blue Heron – Close-ups from Plate 161, Birds of America
- Great Blue Heron - Ardea herodias - USGS Patuxent Bird Identification InfoCenter
- Great Blue Heron Species Account – Cornell Lab of Ornithology
- Great Blue Heron videos, photos, and sounds at the Internet Bird Collection
- Great Blue Heron photo gallery at VIREO (Drexel University)