Cormorant
From Freepedia
- For other uses, see Cormorant (disambiguation).
| Cormorants | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Image:Redfacedcormorant18.jpg Red-faced Cormorant, Phalacrocorax urile | ||||||||||
| Scientific classification | ||||||||||
| ||||||||||
| Genera | ||||||||||
The Phalacrocoracidae family of birds is represented by about thirty species of cormorants and shags. Several different classifications of the family have been proposed recently, but in the one most commonly used, all but three species are placed in a single genus Phalacrocorax, the exceptions being the Galapagos' Flightless Cormorant, the Kerguelen Shag and the Imperial Shag.
Humans have historically exploited cormorants' fishing skills, in China and Japan, where they have been trained by fishermen. Traditional cormorant fishing can be watched in the city of Inuyama, in Aichi Prefecture in Japan. In Guilin, China, cormorant birds are famous for fishing on the shallow Lijiang River.
Because the Great Cormorant's outline while drying its wings suggested a cross, it occasionally featured in medieval heraldry.
Contents |
Names
There is no consistent distinction between cormorants and shags. The names "cormorant" and "shag" were originally the common names of the two species of the family found in Great Britain, Phalacracorax carbo (now referred to by ornithologists as the Great Cormorant) and P. aristotelis (the Common Shag). "Shag" refers to the bird's crest, which the British forms of the Great Cormorant lack. As other species were discovered by English-speaking sailors and explorers elsewhere in the world, some were called cormorants and some shags, depending on whether they had crests or not. Sometimes the same species is called a cormorant in one part of the world and a shag in another, e.g. the Great Cormorant is called the Black Shag in New Zealand (the birds found in Australasia have a crest that is absent in European members of the species). Some modern classifications of the family have divided it into two genera and have tried to attach the name "Cormorant" to one and "Shag" to the other, but this flies in the face of common usage and has not been widely adopted.
Christopher Isherwood was obviously unaware of the distinction when he wrote the poem
- "The common cormorant (or shag)
- Lays eggs inside a paper bag,
- You follow the idea, no doubt?
- It is to keep the lightning out.
- But what these unobservant birds
- Have never thought of, is that herds
- Of wandering bears might come with buns
- And steal the bags to hold the crumbs."
His information about the bird's nesting habits shouldn't be relied on either.
The scientific name is latinized Greek for phalakros (bald) and kora (raven).
Characteristics
Cormorants and shags are medium-to-large seabirds. The majority, including all Northern Hemisphere species, have mainly dark plumage, but some Southern Hemisphere species are black and white, and a few (e.g. the Spotted Shag of New Zealand) are quite colourful. Many species have areas of coloured skin on the face (the lores and the gular skin) which can be bright blue, orange, red or yellow, typically becoming more brightly coloured in the breeding season. The bill is long, thin, and sharply hooked. Their feet are four-toed and webbed, a distinguishing feature among the Pelecaniformes order.
They are coastal rather than oceanic birds, and some have colonised inland waters. They range around the world, except for the central Pacific islands.
All are fish-eaters, dining on small eels, fish, and even water snakes. They dive from the surface, though many species make a characteristic half-jump as they dive, presumably to give themselves a more streamlined entry into the water. Under water they propel themselves with their feet.
After fishing, cormorants go ashore to dry their wings by holding them out in the sun. Unusually for a water bird, their feathers are not waterproofed. This may help them dive quickly, since their feathers do not retain air bubbles.
Cormorants are colonial nesters, using trees, rocky islets, or cliffs. The eggs are a chalky-blue colour. There is usually one brood a year. The young are fed through regurgitation.
Species
For an alternative scientific classification, see Sibley-Ahlquist taxonomy.
- Genus Phalacrocorax
- Brandt's Cormorant, Phalacrocorax penicillatus
- Double-crested Cormorant or White-crested Cormorant, Phalacrocorax auritus
- Great Cormorant, Phalacrocorax carbo
- Neotropic Cormorant, Phalacrocorax brasilianus
- Olivaceous Cormorant or Mexican Cormorant, Phalacrocorax olivaceus
- Pelagic Cormorant or Baird's Cormorant, Phalacrocorax pelagicus
- Red-faced Cormorant, Phalacrocorax urile
- Guanay Cormorant , Phalacrocorax bougainvillii (off Peru, guano collected from nesting colonies of this bird is used to produce internationally traded commercial fertilizer)
- Little Black Cormorant, Phalacrocorax sulcirostris
- Indian Cormorant, Phalacrocorax fuscicollis
- Cape Cormorant, Phalacrocorax capensis
- Socotran Cormorant, Phalacrocorax nigrogularis
- Wahlberg's Cormorant or Bank Cormorant, Phalacrocorax neglectus
- Temminck's Cormorant, Phalacrocorax capillatus
- Common Shag, Phalacrocorax aristotelis
- Rock Shag, Phalacrocorax magellanicus
- Long-tailed Cormorant, Phalacrocorax africanus
- Little Cormorant, Phalacrocorax niger
- Pygmy Cormorant, Phalacrocorax pygmaeus
- Pitt Cormorant or Featherstone's Shag Phalacrocorax featherstoni
- Pied Cormorant or Yellow-faced Cormorant, Phalacrocorax varius
- King Shag, Phalacrocorax carunculatus
- Black-faced Cormorant, Phalacrocorax fuscescens
- Spectacled Cormorant, Phalacrocorax perspicillatus (extinct)
- Red-footed Shag, Phalacrocorax gaimardi
- Spotted Shag Phalacrocorax punctatus
- White-bellied Shag, Phalacrocorax albiventer
- Little Pied Cormorant, Phalacrocorax melanoleucos
- Stewart Island Shag, Phalacrocorax chalconotus
- Chatham Shag, Phalacrocorax onslowi
- Auckland Shag, Phalacrocorax colensoi
- Campbell Shag, Phalacrocorax campbelli
- Bounty Shag, Phalacrocorax ranfurlyi
- Genus Leucocarbo
- Imperial Shag, Leucocarbo atriceps (Previously Antarctic, South Georgian, Heard, Crozet, and Macquarie Shags, Phalacrocorax bransfieldensis, georgianus, nivalis, melanogenis, and purpurascens.)
- Kerguelen Shag, Leucocarbo verrocosus (Previously P. verrocosus.)
- Genus Nannopterum
- Flightless Cormorant, Nannopterum harrisi (confined to the Galapagos Islands where, through evolution, its wings have shrunk to the size of a penguin's flippers)
The King Shag of New Zealand has a number of races previously considered as full species.
