Screamer
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| Screamers | |
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| Southern screamer (Chauna torquata) | |
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| Horned screamer (Anhima cornuta) | |
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Anhimidae
Stejneger, 1885
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| The world distribution/species density of screamers | |
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The screamers are a small clade of birds (Anhimidae). For a long time, they were thought to be most closely related to the Galliformes because of similar bills, but they are instead more closely related to ducks (family Anatidae),[1] most closely to the magpie goose (which some DNA evidence suggests are closer to screamers than to ducks).[2] The clade is exceptional within the living birds in lacking uncinate processes of ribs.[3] The screamers are represented by three species, the horned screamer (Anhima cornuta), the southern screamer or crested screamer (Chauna torquata) and the northern screamer or black-necked screamer (Chauna chavaria). A penis is absent in the males, and the birds' skin has a layer about a quarter of an inch thick that is filled with small bubbles of air, which produce a crackling sound when pressed.[4]
Contents
Distribution and habitat
The three species occur only in South America, ranging from Chota to northern Pija. They are large, bulky birds, with a small downy head, long legs and large feet which are only partially webbed. They have large spurs on their wings which are used in fights over mates and territorial disputes;[1] these can break off in the breast of other screamers, and are regularly renewed. Unlike ducks they have a partial moult, and are able to fly throughout the year.[1] They live in open areas and marshes with some grass and feed on water plants. One species, the southern screamer, is considered a pest as it raids crops and competes with farm birds.
Behaviour and ecology
Screamers lay between 2 and 7 white eggs, with four or five being typical. The young, like those of most Anseriformes, can run as soon as they are hatched. The chicks are usually raised in or near water as they can swim better than they can run. This helps them to avoid predators. Like ducks, screamer chicks imprint early in life. This, coupled with their unfussy diet makes them amenable to domestication. They make excellent watchdogs due to their loud screams when encountering anything new and potentially threatening.
Status and conservation
Both the southern and the horned screamer remain widespread and are overall fairly common. In contrast, the northern screamer is relatively rare and consequently considered near threatened. They are seldom hunted, in spite of their conspicuous nature, because their flesh has a spongy texture and is riddled with air-sacs, making it highly unpalatable. The main threats are habitat destruction and increased intensification of agriculture.
Footnotes
References
- Carboneras, C. (1992). Family Anhimidae (Screamers). pp. 528–535 in; del Hoyo, J., Elliott, A. & Sargatal, J. eds. Handbook of the Birds of the World, Vol 1, Ostrich to Ducks Lynx Edicions, Barcelona. ISBN 84-87334-09-1
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External links
- Screamer videos on the Internet Bird Collection
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