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common name for gregarious, aquatic birds comprising three species in the family Anhimidae. Although they are related to the ducks and geese, they do not resemble them in outward appearance. Screamers possess some unusual anatomical features, such as a layer of insulating air cells that separate the outer skin from the body. This feature is also seen in the pelicans. They share another peculiarity solely with colies, penguins, and ostriches—their feathers grow over the body without any bare spaces (called apteria) in between. Another peculiarity of the screamers is their hollow bones. Finally, they lack particular rib bones that are functional as strengthening elements in all other birds except the extinct Archaeopteryx. The turkey-sized horned screamer (Anhima cornuta) is the largest of the family. It is distinguished by a 3- to 4-in. (8- to 10-cm) hornlike projection on its forehead and by two sharp wing spurs. A creature of the wetlands and tropical rain forest, it is found throughout most of South America. The slightly smaller crested screamer (Chauna torquata) is native to swamps and plains from Brazil to N Argentina. It is distinguished by a short, feathered neck crest. The swan-sized black-necked screamer (C. chavaria) of N Colombia and Venezuela is the smallest and darkest of the family. Using their short, conical, fowllike bills, screamers feed primarily on a vegetable diet of succulent grasses and seeds, although the horned screamer occasionally eats insects as well. Screamers are strong fliers and generally roost in trees. However, their delicate, shallow nests of rushes are built on the water or in marshes. Their white or buffy eggs number from two to six per clutch. Both sexes share incubation duties. The chicks are downy and resemble baby swans. Screamers are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Aves, order Anseriformes, family Anhimidae.
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An extension of Common Lisp providing nondeterministic backtracking and constraint programming.

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References in periodicals archive ?
Imagine having a class of kickers, screamers and biters for seven hours a day, five days a week.
22 ( ANI ): The new Anushka Sharma starrer, 'Pari's teaser, or screamer as it is being called, has hit the nail on its head, yet again.
Daniel Agyei The stage was set for substitute Agyei, who settled things with a late screamer that left Ben Amos with no chance.
SCREAMER: Linfield's Sean Ward roars with joy after his 25-yard rocket hit the net
Or if perhaps she had been a loud baby, a real screamer, and had just grown out of it with age, become calm and circumspect as her baby-ness wore off and the accidents of her personality began to overtake her.
The pair of Crested Screamers at Washington Wetland Centre are well named.
The six-column ad placed by the Arizona Heart institute and Hospital opened with this all-caps screamer: THEY LITERALLY SAVED ME--HEART AND SOLE
Exceptions have been Honda's four-cylinder S2000, which is a screamer, and the six-cylinder NSX.
Course winner The Screamer, Old Pike Girl, successful on her chasing debut at Limerick, and Tobeornotobe, who scored at Tramore on New Year's Day, have also won over fences.
Why was it, groused the Green Mountain Screamer, that whenever the president has a bum week (or John Kerry has a good one), he jacks the rainbow up a hue?
Bournemouth had led though Alan Connell's sixth minute strike, but Spencer blasted a 20-yard equaliser on 17 minutes and then unleashed another screamer on the half hour mark.