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Anhimidae - Screamers

Screamer
Southern Screamer Chauna torquata ©James Lowen Website

The Anhimidae or Screamers are a small clade of birds. 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), most closely to the magpie goose (which some DNA evidence suggests are closer to screamers than to ducks). The clade is exceptional within living birds in lacking uncinate processes of ribs. The screamers are represented by three species.

They only occur in South America. They are large, bulky birds, with a small downy head, long legs and large feet which are only partly webbed. They have large spurs on their wings which are used in fights over mates and territorial disputes and can break off in the breast of other screamers. The spurs re-grow and are, anyway, regularly renewed. Unlike ducks they have only a partial moult, and are able to fly throughout the year. 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.

They 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, which 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.

The IOC list just three species of Screamers in the family Anhimidae; which are:

Horned Screamer Anhima cornuta
Northern Screamer Chauna chavaria
Southern Screamer Chauna torquata

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.

Family Links

Screamers Anhimidae

Family Account

The Screamers are a small family of Neotropical waterfowl, placed in the Anseriformes (with ducks, geese, and swans) but long separated from typical waterfowl. The three species of Screamers have long been considered to form a separate family…

Screamers Anhimidae

Family Account

Screamers Anhimidae

IBC Family Account

IBC family account and taxonomy...

Screamers Anhimidae

HBW Family Account

HBW family account...

Species Links

Horned Screamer Anhima cornuta

Species Account

These large birds have a wing span of about 1.70 metres. Both sexes have a horn protruding from the forehead but this is quite brittle and can break off although it grows back again…

Northern Screamer Chauna chavaria

Species Account

The Northern Screamer (Chauna chavaria), also known as the Black-necked Screamer, is a large species of bird in the small family Anhimidae, the screamers. It is a resident breeder in northern Colombia, in Chocó, Antioquia, Córdoba, Sucre, Bolívar, Magdalena, Santander, and Cesar Departments and northwestern Venezuela, in Zulia, Mérida, and Trujillo States.[2] On average, they are 88.9 cm (35 in) long and weigh about 3.9 kg (8.6 lb)...

Southern Screamer Chauna torquata

Species Account

The Screamers are related to ducks, geese and swans as members of the Anseriformes order of birds. They are generally believed to be more primitive forms of the order like the Magpie Goose (Anseranas semipalmata) of Australia. However, Sick says that the fact that they have abandoned the filtering technique of eating suggests that they are, in fact, more evolved than their duck and goose cousins…

Southern Screamer Chauna torquata

Species Account

Southern Screamer Chauna torquata

Cornell Species Account

Cornell species account with image...

Southern Screamer Chauna torquata

Species Account

Sound archive and distribution map...

Southern Screamer Chauna torquata

IUCN Species Status

IUCN species profile...

Southern Screamer Chauna torquata

IBC Species Account

IBC species account and taxonomy...

Southern Screamer Chauna torquata

HBW Species Account

HBW species account...

Northern Screamer Chauna chavaria

BirdLife Species Account

BirdLife species profile...

Northern Screamer Chauna chavaria

Cornell Species Account

Cornell species account with images...

Northern Screamer Chauna chavaria

Species Account

Sound archive and distribution map...

Northern Screamer Chauna chavaria

IBC Species Account

IBC species account with taxonomy...

Northern Screamer Chauna chavaria

HBW Species Account

HBW species account...

Horned Screamer Anhima cornuta

Species Account

Horned Screamer Anhima cornuta

Cornell Species Account

Cornell species account and image...

Horned Screamer Anhima cornuta

BirdLife Species Account

BirdLife species profile...

Horned Screamer Anhima cornuta

Species Account

Species account and images...

Horned Screamer Anhima cornuta

Species Account

Sound archive and distribution map...

Horned Screamer Anhima cornuta

IBC Species Account

IBC species account and taxonomy...

Horned Screamer Anhima cornuta

HBW Species Account

HBW species account...

Number of Species

Number of bird species: 3

All three species are monotypic

Other Links

Horned Screamer Anhima cornuta

Article

Observations on the Horned Screamer - Frank B. Gill, F. J. Stokes and C. C. Stokes, The Wilson Bulletin - Vol. 86, No. 1 (Mar., 1974), pp. 43-50

Photographers & Artists

Southern Screamer Chauna torquata

Video

Southern Screamer Pampastrip ~ Rurenebaque Bolivia

Northern Screamer Chauna chavaria

Video

Northern Screamers are really cool birds we normally find in the Magdalena Valley while driving; these big birds are almost endemics to Colombia. This video if from the 1st trip from a series with US clients birding all Colombia...

Horned Screamer Anhima cornuta

Video

Pantanal BirdClub always see this magnificent species in our stakeout to the way to Emas NP...