Black-chested Snake Eagle

About

The Black-chested Snake Eagle is a large, distinctive raptor found in sub-Saharan Africa. It is characterized by its striking black upperparts and chest contrasting sharply with pure white underparts. As its name suggests, its diet primarily consists of snakes and other reptiles.

Size & lifespan

Length

60-66 cm

Wingspan

160-185 cm

Weight

1.1-2.5 kg

Lifespan

Up to 15-20 years in the wild

Diet

Carnivore (primarily snakes and other reptiles)

Physical characteristics

Plumage

Adults have a glossy black head, neck, and upper breast, sharply demarcated from the pure white lower breast, belly, and underwing coverts. The upperparts are dark brown to black. The flight feathers (primaries and secondaries) are white with broad black tips and a narrow black trailing edge, forming a distinctive pattern in flight. The tail is short, white with a single broad black subterminal band.

Beak shape

Strong, hooked beak, dark grey to black with a yellow cere.

Eye color

Bright yellow.

Leg color

Pale grey to whitish, with strong talons.

Distinguishing features

The stark contrast between the black chest and white belly is the most prominent field mark. In flight, the white underwing with black tips and trailing edge, and the short white tail with a single black band are diagnostic. The large, bright yellow eyes are also characteristic.

Juvenile appearance

Juveniles are browner overall, with a streaked rufous-brown head and breast, and often have rufous wash on the underparts. The underwing pattern is similar to adults but may be less sharply defined. The eyes are initially grey-brown, gradually turning yellow with age.

Seasonal changes

No significant seasonal plumage changes.

Sexual dimorphism

Males and females are generally similar in plumage, though females tend to be slightly larger than males.

How to identify

1. 1

   Plumage Contrast

   Look for the unmistakable sharp contrast between the solid black head, neck, and upper breast and the pure white lower breast and belly. This is the most reliable field mark for adults.

2. 2

   Underwing Pattern

   In flight, observe the underwing: it is predominantly white with broad black tips to the primaries and a narrow black trailing edge on the secondaries. This creates a very clean, two-toned appearance.

3. 3

   Tail Pattern

   The short, white tail with a single, broad black subterminal band is another key identifier, especially visible in flight.

4. 4

   Eye Color

   The large, bright yellow eyes are very distinctive and stand out against the dark head.

5. 5

   Flight Style

   Watch for its characteristic soaring and hovering behavior, often holding its wings in a shallow 'V' shape. This hunting style is typical of snake eagles.

Habitat & range

Biomes

Savanna, open woodlands, grasslands, semi-desert, and cultivated areas.

Geographic range

Sub-Saharan Africa, from Senegal and Gambia east to Ethiopia and Somalia, and south through East Africa to South Africa.

Elevation range

Sea level up to 3,000 meters, but typically found at lower to mid-altitudes.

Preferred environments

Prefers open country with scattered trees or bushes for perching and nesting, often near water sources. Avoids dense forests and true deserts.

Behavior

Activity time

Diurnal.

Feeding habits

A specialized snake-eater. It hunts by soaring high, often hovering on updrafts, then swooping down to catch prey on the ground. It also hunts from a perch. Snakes are typically swallowed head-first, sometimes while still in flight. It also preys on other reptiles (lizards, chameleons), amphibians, and occasionally small mammals or birds.

Social behavior

Generally solitary or found in pairs. Not typically seen in large flocks.

Flight pattern

Characterized by long periods of soaring and hovering, often with wings held in a shallow 'V' shape. It has a buoyant, graceful flight. When hunting, it can hover almost motionless against the wind, scanning the ground below.

Migration pattern

Mostly resident throughout its range, but some populations, particularly in the northern and southern extremes, may undertake local or partial migrations in response to rainfall and prey availability. Juveniles may disperse widely.

Territoriality

Pairs defend a breeding territory, especially around the nest site.

Breeding & reproduction

Breeding season

Varies geographically: typically August-November in southern Africa, March-September in East Africa, and November-March in West Africa, often coinciding with the dry season or early rains.

Nesting habits

Builds a relatively small, flat stick nest, typically 60-70 cm in diameter, lined with green leaves. Nests are usually placed high in the canopy of a large tree, often near the top, making them difficult to spot.

Clutch size

1 egg (rarely 2)

Egg description

Usually a single egg, rarely two. Eggs are dull white, sometimes with faint reddish-brown spots or streaks.

Incubation period

Approximately 45-52 days, primarily by the female.

Fledging period

Chicks fledge at around 90-100 days, but remain dependent on parents for several weeks to months after leaving the nest.

Parental care

Both parents participate in raising the young, with the female doing most of the incubation and early brooding, while the male provides food. Both parents feed the chick after hatching.

Where to find

Field tips

1. Scan the Sky. Spend time scanning the sky, especially during the warmer parts of the day, as they frequently soar at great heights while hunting.
2. Look for Perches. Check prominent dead trees, utility poles, or tall isolated trees in open areas, as they often use these as lookout posts.
3. Observe Hunting Behavior. If you see a large raptor hovering motionless in the air, it's likely a snake eagle scanning for prey. This behavior is a strong indicator.
4. Listen for Calls. During the breeding season, listen for their distinctive 'kwo-kwo-kwo' calls, which can help locate them even when out of sight.

Similar species

Quick facts

Primary Diet:

Snakes

Hunting Style:

Soaring and hovering

Distinctive Feature:

Black chest, white belly

Conservation Status:

Least Concern

Habitat Preference:

Open woodlands and savanna

Fun facts

• The Black-chested Snake Eagle has exceptionally keen eyesight, allowing it to spot snakes from high altitudes.
• Despite its specialized diet, it is highly resistant to snake venom, though it typically aims for the head to incapacitate its prey quickly.
• It is one of the most widespread and commonly seen snake eagles in Africa.
• The genus name 'Circaetus' comes from Greek 'kirkos' (a kind of hawk) and 'aetos' (eagle), while 'pectoralis' refers to its distinctive chest plumage.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Accipitriformes

Family

Accipitridae

Genus

Circaetus

Species

Circaetus pectoralis

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