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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.


An extension of Common Lisp providing nondeterministic backtracking and constraint programming.

References in periodicals archive ?
Right before the screamer #5, the 'Ae Dil Hai Mushkil' star shared a poster of the film on her social media.
Screamer stared at him, with her eyes as calm and round as the wheels on the bus.
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.
What I mean is, does anyone know why Screamer Wood is so named?
From the Airdrop Directorate, nominations were the Rough Terrain Cargo Parachute; Micro Rappel System; Screamer System; and Ripcord Grip Insert for the Modified Improved Reserve Parachute System.
Screamer also provides a DOS utility that strips away Microsoft's DRM protection of audio files.
A person who prefers calm conversation will not deal well with a screamer just as a screamer will not deal well with the calm person.
Summary: New Delhi [India], Feb 2 (ANI): Bollywood star Anushka Sharma has shared the second screamer of her upcoming horror mystery film 'Pari'.
There were some great There were some great goals last week - including a goals last week - including a screamer from Charlie Adam.
A public hearing is to take place to hear testimony from an expert witness in its case against Screamer Telecoms over alleged radio transmission without a spectrum licence, declares the Independent Communications Authority of South Africa (ICASA).
Freedman watched in horror as Oliver Norwood's 25-yard screamer grabbed a stunning away win for Mark Robins's high-flying Terriers.
A lacklustre Fulham side were thankful for Bobby Zamora's first-half equaliser, tapped home from close range, which cancelled out Anton Robinson's screamer.