African Darter

About

The African Darter is a large, slender waterbird known for its snake-like neck and specialized spear-fishing technique. It is often seen swimming with only its head and neck visible above water, hence the common name 'snakebird'. Its plumage is predominantly dark, with distinctive silver-grey streaking on the back and wings, particularly in males.

Size & lifespan

Length

79-97 cm

Wingspan

110-120 cm

Weight

1.0-1.3 kg

Lifespan

Up to 15 years in the wild

Diet

Carnivore (primarily fish)

Physical characteristics

Plumage

Adult males are glossy black with a rufous-brown head and neck, featuring a prominent white stripe extending from below the eye down the side of the neck. The back and wings are adorned with silvery-grey streaks and spots. Females are generally duller, with a paler, more greyish-brown head and neck, and less distinct streaking on the back. Both sexes have a long, pointed bill and a long, stiff tail.

Beak shape

Long, straight, and sharply pointed, yellowish to brownish-yellow.

Eye color

Yellow to reddish-brown, surrounded by a patch of bare yellow skin.

Leg color

Dull yellow to brownish-yellow, with fully webbed feet.

Distinguishing features

Extremely long, slender, S-shaped neck; dagger-like bill; long, stiff tail often fanned for balance; habit of swimming with only head and neck visible; distinctive silver-grey streaking on back and wings.

Juvenile appearance

Juveniles are paler overall, with a brownish-grey plumage, a lighter throat, and less distinct streaking on the back compared to adults. The white neck stripe is often absent or very faint.

Seasonal changes

No significant seasonal plumage changes. Breeding plumage is essentially the same as non-breeding, though colors may appear more vibrant during breeding season.

Sexual dimorphism

Males are generally darker, with a more pronounced rufous neck and a clearer white stripe. Females are paler, with a greyish-brown neck and less distinct markings. Size differences are minimal.

How to identify

1. 1

   Neck and Bill

   Look for the extremely long, slender, S-shaped neck and the straight, dagger-like bill. This is the most distinctive feature, especially when swimming.

2. 2

   Swimming Posture

   Observe its unique swimming style: often only the head and neck are visible above the water, resembling a snake.

3. 3

   Plumage (Adult Male)

   Note the glossy black body, rufous-brown head and neck, and the prominent white stripe running down the side of the neck. Look for the fine silver-grey streaking on the back and wings.

4. 4

   Plumage (Adult Female)

   Identify females by their paler, more greyish-brown head and neck, and less distinct white stripe and back streaking compared to males.

5. 5

   Drying Behavior

   Look for darters perched with their wings spread wide, drying their non-waterproof plumage after a dive. This posture is characteristic.

6. 6

   Tail

   In flight or perched, note the long, stiff, fan-shaped tail, which is used for steering and balance.

Habitat & range

Biomes

Freshwater wetlands, estuaries, and coastal lagoons.

Geographic range

Sub-Saharan Africa, including Madagascar. Also found in parts of the Middle East (e.g., Iraq, Iran) and historically in southern Asia, though the Asian population is now often considered a separate species (Oriental Darter, Anhinga melanogaster).

Elevation range

Primarily lowlands, up to approximately 1,500 meters, but generally associated with water bodies at any accessible elevation.

Preferred environments

Still or slow-moving waters such as large rivers, lakes, dams, swamps, marshes, and estuaries. Requires emergent or overhanging vegetation for perching, nesting, and drying wings.

Behavior

Activity time

Diurnal.

Feeding habits

A specialized piscivore. It hunts by swimming submerged, using its long, sharp bill to spear fish. After spearing, it surfaces, tosses the fish into the air, and swallows it headfirst. Also consumes amphibians, aquatic insects, and crustaceans. Often seen perched with wings spread to dry, as its plumage is not fully waterproof.

Social behavior

Typically solitary when foraging, but often roosts and nests colonially with other waterbirds (e.g., cormorants, herons).

Flight pattern

Strong, direct flight with rapid wing beats, often interspersed with glides. Soars on thermals to considerable heights. In flight, the neck is extended, and the long tail is prominent.

Migration pattern

Mostly resident throughout its range, but may undertake local movements in response to water levels or food availability, especially in arid regions.

Territoriality

Defends a small area around the nest during breeding season, but generally not highly territorial outside of nesting.

Breeding & reproduction

Breeding season

Varies geographically, often coinciding with periods of high water levels or after rains. Can breed year-round in some tropical areas, but typically August-March in southern Africa.

Nesting habits

Nests colonially, often alongside cormorants and herons, in trees or reeds over water. The nest is a bulky platform of sticks and reeds, lined with finer material.

Clutch size

2-6 eggs

Egg description

2-6 (typically 3-5) pale blue or greenish-blue eggs, often covered with a chalky white layer that gets stained over time.

Incubation period

25-30 days

Fledging period

Chicks fledge at around 50-60 days, but remain dependent on parents for some time after.

Parental care

Both parents share incubation duties and care for the young. Chicks are altricial (helpless at birth).

Where to find

Field tips

1. Scan water edges. Look for them swimming stealthily near the banks or among submerged vegetation. Their low profile can make them hard to spot.
2. Look for drying birds. After diving, they often perch on branches, rocks, or dead trees with wings outstretched to dry. This is an excellent opportunity for observation.
3. Observe fishing behavior. Watch for their characteristic spear-fishing technique, where they dive and then surface to toss and swallow fish.
4. Check mixed colonies. During breeding season, look for them nesting alongside cormorants and herons in suitable trees or reedbeds.

Similar species

Quick facts

Diet:

Fish, amphibians, aquatic insects

Habitat:

Freshwater wetlands, estuaries

Conservation Status:

Least Concern

Distinguishing Feature:

Snake-like neck, dagger bill, drying wings

Nesting:

Colonial, in trees or reeds over water

Fun facts

• The African Darter's common name 'snakebird' comes from its habit of swimming with only its head and long, slender neck visible above the water, resembling a snake.
• Unlike many other waterbirds, darters have wettable plumage, meaning their feathers absorb water. This reduces their buoyancy, allowing them to dive and swim underwater more efficiently to pursue fish. They then need to dry their wings by perching with them spread open.
• Their unique neck vertebrae allow them to rapidly thrust their head and bill forward like a spear, impaling fish with remarkable speed and precision.
• They have a specialized gular pouch (throat pouch) that can expand to help them swallow large fish whole.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Suliformes

Family

Anhingidae

Genus

Anhinga

Species

Anhinga rufa

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