Saturday, Sep 20, 2014

Grey Herons

Heron Information ... Heron Species (Listing) ... Heron Species Photos

Grey Heron in flight, landing

Grey Heron in flightOverview ... Alternate (Global) Names

Distribution / Habitat ... Subspecies, Ranges and ID

Description ... Calls / Vocalizations

Breeding / Nesting ... Diet / Feeding ... Lifespan / Longevity





The Grey Herons (Ardea cinerea) - also known as Common Herons or "Cranes" in Ireland - are wading birds with an extensive geographic range which extends throughout temperate Europe and Asia, and parts of Africa. In Europe, they are the largest herons.

They are related and resemble the North American Great Blue Herons and the South American Cocoi Herons or White-necked Herons - both of which are slightly larger in size. Since their ranges don't overlap - with the exception of some occasional vagrants - confusion is unlikely for the most part. The Great Blue Heron can be identified by their chestnut-brown flanks and thighs, and the Cocoi Heron has more extensive black markings on the head than the other two.

The Australian White-faced Herons are often incorrectly referred to as Grey Herons, leading to confusion with the European species.

Grey Heron and  Distribution MapThese herons are not sociable and, outside the breeding season, are usually seen alone. They show aggression towards other birds by performing snake-like stabbing motions with their head and raising their crests.


Distribution / Habitat

Grey Herons occur throughout most of temperate Europe (where they are common and widespread throughout Great Britain and Ireland), and their range extends through Russia as far east as Japan; and south through China to India. They are also found in parts of Africa and in Madagascar.

Vagrants have been reported in North America, Greenland and Australia.

Grey Herons Fighting These Herons are partially migratory. Those breeding in areas with icy winters will often retreat to warmer regions, with some traveling great distances to get to and from their breeding territories.

They mostly inhabit freshwater habitats, such as rivers, lakes, ponds and reservoirs and marshes, as well as saltwater or brackish inlets and estuaries.


Subspecies, Ranges, ID:

  • Common Grey Heron, European Blue Heron, European Common Heron, European Heron (Ardea cinerea cinerea - Linnaeus, 1758)
    • Range: Europe, Africa, western Asia

  • Comoro Grey or Gray Heron, Comoro Grey Heron (Ardea cinerea firasa - Hartert, 1917)

  • Ardea cinerea jouyi (Clark, 1907)
    • Range: Eastern Asia

  • Grey Herons (Ardea cinerea)Mauritanian Heron (Ardea cinerea monicae - Jouanin and Roux, 1963) - by some considered a separate species
    • Range: Found on islands near Banc d'Arguin, Mauritania
    • ID: Lighter plumage and shorter crest.

  • [Eastern Grey or Eastern Grey Heron, Ardea cinerea rectirostris] - usually considered invalid

Description

Grey Herons are large birds that stand 33.1 - 40.2 inches (84 - 102 cm) tall, including the outstretched neck, have a wingspan of 61 - 77 inches (155 - 195 cm) and weigh between 2.2 - 4.6 lbs (1.1 - 2.1 kg).

As suggested by their common names, the upper plumage is predominantly grey - including the back, wings and most of the neck. The plumage below is off-white.

The head is white with a broad black "eyebrow" (supercilium) and long black feathers that extend from the eyes to the beginning of the neck, forming a crest.

The strong, dagger-like bill and the legs are yellowish in non-breeding adults, turning deep orangey / reddish in breeding birds.

They fly with their long necks retracted (S-shaped), and the broad, arched wings and their long legs trailing behind them are distinctive. Their flight is described as slow.

Grey Herons (Ardea cinerea)

Grey Herons (Ardea cinerea) - Breeding PairGender ID:

Males and females look alike; except females are generally smaller.

Immature birds:

Juveniles have dull grey heads with dark grey crown feathers that they retain into their first winter, after which they begin to develop the white forehead and black head crest of the adult.

Similar Species:

Its large size, combined with the pale grey plumage and distinctive shape distinguish the Grey Heron from all other birds.

Grey Herons are larger than other herons, which are often half their size.

In flight, Grey Herons can easily be told apart from cranes, storks and spoonbills, as Grey Herons fly with the head pulled back with its long neck retracted (S-shaped) towards the body, while the others fly with the head extended.

Grey Heron feeding on a fish


Grey Heron (Ardea cinerea) Diet / Feeding

Grey Herons mostly feed on fish, frogs and insects; but they also may take reptiles, small mammals, and small birds, such as ducklings, tern chicks, young and adult snipes, plovers and the nestlings of warblers. The largest birds these herons are recorded to have attempted to feed on are White-throated Rails.

They mostly hunt in shallow water - either by patiently standing completely still in or at the side of water waiting for prey, or slowly stalking it, and then striking rapidly when it comes into range either by catching it in the bill or spearing it. Prey is often swallowed whole.

They usually protect their feeding territorious against intruders.

They have also adapted well to urban environments, where the visit street markets and snackbars (as recorded in Amsterdam, Netherlands). They also visit the zoo during those times when the pelicans, seals and penguins are fed; or accept offerings from individuals or commercial fishermen.


Breeding / Nesting

Grey Herons breed either solitary or in colonies - known as heronries - in trees close to bodies of water, such as lakes, the seashore or other wetlands, or in reedbeds. They are generally loyal to their breeding sites, returning to them year after year, including successive generations.

At the beginning of the breeding season, males select nesting sites. Depending on the situation, the following may happen:

  • Males are approached by one or more females; he will chase those away that he is not interested in by standing as tall as possible, with neck and crown feathers erect, then recoiling and stabbing the head forward like a snake. If one of the females peaks his interest, he will display for the female he likes, pointing his bill down and the head so low that it may hang below the level of the nest. Once mutual interest has been established, the pair engages in a mutual grooming behavior called allopreening.

  • Males actively seek to attract suitable females to their nest sites by displaying to them. The male's nuptial display involves low grating calls and bill clapping, stretching the wings and their necks, bowing and arching backwards so that the head is above the back pointing their bill upwards to initiate preening.

Bonded pairs will perform greetings ceremonies whenever one or other arrives at the nest, which involves raising and lowering of the wings and their plumes.

Pairs generally remain together throughout the breeding season. Most nesting activities are observed between February to early June.

The bulky platform nests are constructed out of branches, sticks, grasses and other material the males could gather; and these nests sometimes measure 3 feet or 1 meter across. They are placed in the crowns of tall trees, but have also been reported in dense undergrowth and occasionally on bare ground. These nests are often reused in following seasons, or subsequent nests built upon those of previous years. The size of the nest is an important consideration for females, who favor larger nests, and males will fiercely defend those nests.

There are great variations as far as the size of the clutch is concerned - as few as one or as many as 10 have been reported in a nest. This will largely depend on how favorable the environmental conditions are for raising young. Most nests contain 4 - 5 light blue-green eggs. The parents take turn incubating the eggs for 25 - 26 days to hatching.

The hatchlings are covered in down and are being taken care of by both parents who protect and feed them regurgitated fish. The loud clicking calls of the hungry young are heard throughout the day. Initially, the parents will feed them directly by regurgitating into their bills, and later, they will regurgitate food onto the nest and the chicks compete for the food, and may push others out of the nest or even cannibalize deceased nest mates.

The chicks leave the nest when they are 50 days old, but will still remain close to their parents until they are self-sufficient and independent, a few weeks later . They reach reproductive maturity when they are about one year old (the following breeding season).

These herons usually only produce one clutch a year; however, they may replace lost broods.

Flying Grey Heron


Calls / Vocalizations / Sounds

Their call is described as a loud croaking "fraaank".

Sound Recordings


Alternate (Global) Names

Afrikaans: Bloureier ... Albanian: Çapka e përhime, Çapka e përhimë ... Arabic: البلشون الرمادي, البلشون الرمادي الزرقي, الزرقي, مالك الحزين الرمادي ... Armenian: [gorsh dzknkul], [Mokhraguyn Taregh ], գորշ ձկնկուլ, Մոխրագույն Տառեղ ... Azerbaijani: Boz vağ, Boz vağ quşu ... Basque: Bernat pescaire, Lertxun, Lertxun hauskara ... Bulgarian: Сива чапла ... Bengali: সারস ... Bosnian: Caplja ... Breton: Ar gerc'heiz louet, Gerc'heiz, Kerc'heiz, Marc'harid-gouzoug-hir ... Catalan: Agró blau, Bernat pescaire, Garsa ... Chinese: [cang-lu], [chang-bo lao-deng], [hui-guan], [hui-lu], [lao-deng], [qing-zhuang], 灰鹭, 灰鹳, 老等, 苍 鹭, 苍鹭, 蒼鷺, 长脖老等, 青庄 ... Croatian: Siva Caplja, Siva Čaplja ... Czech: Volavka popelavá ... Danish: Fiskehejre ... Dutch: Blauwe Reige ... Esperanto: Griza ardeo ... Estonian: Hallhaigur ... Faroese: Hakaspjað, Hegri, Pinnur í reyv ... Flemish: Reiger ... Finnish: Harmaahaikara ... French: Héron cendré, Héron huppé, Héron pâle ... Frisian: Ielreager ... Gaelic: Corra Riathach, Corra-Ghritheachr ... Georgian: რუხი ყანჩა ... German: Fischreiher, Graureiher ... Greek: Σταχτοτσικνιάς ... Hebrew: אנפה אפורה ... Hindi: Sambal narai, बगुला ... Hungarian: Szürke gém ... Indonesian: Cangak Abu, Cangkak abu ... Icelandic: Gráhegri ... Italian: Airon, Airóne, Airone cenerino, Airòun, Aurana ... Irish: Corr éisc, Corr Réisc ... Japanese: aosagi, Ao-sagi ... Korean: 왜가리 ... Lithuanian: Gęžė, Govaras, Kumpakaklis, Pilkasis garnys, Pilkasis starkus ... Malagasy: Langoromavo, Vano, Vanokasira ... Macedonian: Пепелава (Сива) чапја, Сива чапjа ... Mongolian: Хухэ дэглы, Хөх дэглий ... Malay: Pucung Seriap, Seriap ... Maltese: Russett griz, Russett Griż ... Norwegian: Fiskeheire, Gråhegre, Heire ... Persian: حواصيل , ماهيخوار ... Polish: czapla siwa ... Portuguese: garça real, garça-cinza, Garça-real, Garca-real-europeia, garça-real-européia ... Romanian: Stîrc cenuşiu ... Romany: Kokosturka, Kokosturko ... Russian: Seraya Tsaplya, Серая цапля, Цапля серая ... Scots: Corra ghritheach, Corra riathach ... Slovak: Volavka popolavá ... Slovenian: siva caplja, siva čaplja, sivacaplja ... Serbian: siva caplja, siva čaplja, Сива цаплја, Сива чапља ... Spanish: Garza Gris, Garza Real ... Swedish: Grå häger, Gråhäger, Häger ... Swahili: Koikoi Kijivu, Kongoti, Korongo ... Tibetan: Kam ka ... Turkmen: külrengi balıkçıl ... Turkish: Gri (Adi,Külrengi) Balıkçıl, Gri balıkçıl, gri balykçyl, Külrengi balıkçıl ... Ukrainian: Сіра чапля, Чапля сіра ... Venetian: Sgarza... Vietnamese: Diệc xám ... Welsh: Crêyr glas, Crëyr glas, Crychydd, Crёyr Glas, Garan ... Xhosa: Isikhwalimanzi ... Zulu: uNokilonki

Grey Heron


Lifespan / Longevity

The oldest recorded Grey Heron lived 23 years and 9 months. However, the average life expectancy of these birds in the wild is only about 5 years. The mortality is highest during the first year, when 67% of all birds die for various reasons, but most of them com/fall victim to predation. In the second year, the mortality rate declines nearly 30% and continues to fall thereafter.


Relevant Web Resources

Grey Heron

forests.

Species Research by Sibylle Johnson

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