Anhinga
Anhinga
Anhinga anhinga
At a Glance
A long-necked, long-tailed swimmer of southeastern swamps. Often seen perched on a snag above the water, with its wings half-spread to dry. Can vary its buoyancy in water, sometimes swimming with only head and neck above water (earning it the nickname of 'Snakebird'). Often solitary when feeding, it roosts in groups and nests in colonies. Looks rather like a cormorant when perched, but not in flight, when the long tail may be spread wide as the Anhinga soars high on outstretched wings. Anhingas are silent at most times, but around nesting colonies they make various croaking and clicking sounds.
All bird guide text and rangemaps adapted from Lives of North American Birds by Kenn Kaufman© 1996, used by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Category
Anhingas, Upright-perching Water Birds
IUCN Status
Least Concern
Habitat
Coasts and Shorelines, Freshwater Wetlands, Lakes, Ponds, and Rivers, Saltwater Wetlands
Region
Florida, Mid Atlantic, Plains, Southeast, Texas
Behavior
Flap/Glide, Soaring
Population
2.000.000
Range & Identification
Migration & Range Maps
Withdraws from northern breeding areas in winter. Many go to Mexico, migrating around Gulf of Mexico, with migrant flocks seen along Texas coast in spring and fall. Some remain all winter in south, especially peninsular Florida. Lone strays occasionally wander far to north during warmer months.
Description
34-36" (86-91 cm). Suggests a cormorant but has a long, narrow, dagger-pointed bill, long fan-shaped tail, white markings on upper side of wings. Female has buff head and neck, male is mostly black. In flight, notice the fan-shaped tail tip, long neck extended out in front.
Size
About the size of a Heron, About the size of a Mallard or Herring Gull
Color
Black, Brown, Green, Tan, White, Yellow
Wing Shape
Broad, Fingered, Long, Pointed
Tail Shape
Long, Rounded, Square-tipped
Songs and Calls
Low grunts like those of cormorants.
Call Pattern
Flat, Simple
Call Type
Chatter, Odd, Rattle
Habitat
Cypress swamps, rivers, wooded ponds. Mostly on quiet and sheltered waters, such as freshwater marshes, slow-moving rivers through cypress swamps, inlets and lagoons lined with mangroves, lakes with standing dead trees.
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Behavior
Eggs
4, sometimes 2-5. Whitish to pale blue, becoming nest-stained. Incubation is by both sexes, 25-29 days.
Young
both parents feed young. After age of about 2 weeks, if young are disturbed, they will jump out of nest into water; at least sometimes, they are able to climb back up to nest. Young climb in nest tree using feet and bill. Age at first flight unknown.
Feeding Behavior
Hunts for fish while swimming underwater or at surface. Not usually a fast swimmer, mostly waits for fish to come near, then impales them with lightning-fast thrust of long, pointed bill. Structure of neck is specially adapted for this kind of rapid thrust. Fish often tossed in air, then swallowed headfirst.
Diet
Mostly fish. Feeds primarily on "rough" fish of little value to humans, including catfish, mullet, pickerel, sucker, gizzard shad. Also aquatic insects, crayfish, shrimp, sometimes snakes, baby alligators, small turtles.
Nesting
Sometimes nests in isolated pairs, usually in groups, in mixed colonies with herons, ibises, cormorants. Male chooses site in colony and displays there to attract mate. Displays include waving wings, raising tail up over back, pointing bill skyward and then bowing deeply. Nest: built mostly by female, with material supplied by male. A platform of sticks, often lined with green leaves. Sometimes takes over an occupied nest of heron or egret.
Conservation
Conservation Status
Climate Threats Facing the Anhinga
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