Secretarybird

Informazioni

The Secretarybird is a large, terrestrial bird of prey endemic to Africa. It is renowned for its long, crane-like legs, distinctive crest of black feathers resembling quill pens tucked behind its ears, and its unique hunting method of stomping prey. Despite being a bird of prey, it spends most of its time on the ground.

Dimensioni e longevità

Lunghezza

112-152 cm (44-60 in)

Apertura alare

191-212 cm (75-83 in)

Peso

2.3-4.3 kg (5.1-9.5 lb)

Longevità

10-15 years in the wild, up to 19 years in captivity

Dieta

Carnivore, primarily feeding on snakes, lizards, insects, small mammals, and birds.

Caratteristiche fisiche

Piumaggio

Adults have a pale grey body, black flight feathers, black thighs, and a black crest of elongated feathers on the nape. The tail is long with two central elongated black feathers and white outer feathers. The underparts are white, contrasting with the black thighs.

Forma del becco

Strong, hooked beak, pale grey to yellowish at the base, darkening to black at the tip.

Colore degli occhi

Dark brown eyes, surrounded by bare orange-red facial skin.

Colore delle zampe

Long, scaly, pale grey to yellowish-orange legs, with short, blunt talons.

Caratteristiche distintive

Very long legs, distinctive crest of black feathers, bare orange-red facial skin, and a long tail with two central streamers. Its terrestrial hunting style is also highly distinctive.

Aspetto giovanile

Juveniles are similar to adults but have browner plumage, especially on the body and wings, and a less developed crest. The bare facial skin is paler, often yellowish, and the tail streamers are shorter.

Cambiamenti stagionali

No significant seasonal changes in plumage. Plumage remains consistent year-round.

Dimorfismo sessuale

Males and females are generally similar in plumage, though males may be slightly larger and have longer tail streamers. Differences are subtle and not reliable for field identification.

Come identificare

1. 1

   Overall Shape and Size

   Look for a very large, long-legged bird with a relatively small head and a long tail. Its terrestrial stance is unique among birds of prey.

2. 2

   Plumage and Coloration

   Note the pale grey body, black flight feathers, black thighs, and white underparts. The black crest on the nape is a key feature.

3. 3

   Head and Facial Features

   Observe the bare orange-red facial skin around the dark eyes and the distinctive black crest feathers resembling old-fashioned quill pens.

4. 4

   Legs and Feet

   Its extremely long, scaly, pale grey to yellowish-orange legs are unmistakable. Unlike most raptors, its talons are relatively blunt, adapted for walking and stomping rather than grasping.

5. 5

   Tail

   The long tail with two central elongated black streamers is characteristic.

6. 6

   Behavior

   Its primary terrestrial hunting method, involving walking and stomping on prey, is a strong identifier. When flying, look for its slow, deliberate wing beats and trailing legs.

Habitat e areale

Biomi

Grasslands, savannas, open shrublands, and semi-deserts.

Areale geografico

Sub-Saharan Africa, from Senegal and Mauritania east to Somalia, and south to South Africa. Absent from dense forests and hyper-arid deserts.

Fascia altitudinale

Typically found from sea level up to 3,000 meters (9,800 ft).

Ambienti preferiti

Prefers open grasslands and savannas with scattered acacia trees or other suitable nesting sites, often near water sources but not necessarily dependent on them.

Comportamento

Periodo di attività

Diurnal, active during daylight hours, particularly in the morning and late afternoon.

Abitudini alimentari

Primarily terrestrial hunter. Walks long distances (up to 30 km/day) searching for prey. Known for its unique hunting technique of stomping on prey, especially snakes, with its powerful legs to stun or kill them. Also uses its wings for balance and to flush out prey. Swallows small prey whole; larger prey is torn apart.

Comportamento sociale

Typically solitary or found in pairs. Pairs maintain large territories. Juveniles may form small groups after fledging but disperse as they mature.

Tipo di volo

Despite its large size, it is a strong flyer, often soaring to considerable heights on thermals. Flight is characterized by slow, deliberate wing beats, often with legs trailing behind the tail. Takes off with a running start.

Migrazione

Resident throughout its range, though local movements may occur in response to rainfall and prey availability.

Territorialità

Highly territorial, especially during the breeding season. Pairs defend their nesting and foraging areas from other Secretarybirds.

Riproduzione

Stagione riproduttiva

Varies geographically, often coinciding with the dry season or early wet season, allowing for easier prey detection. Can breed year-round in some areas.

Abitudini di nidificazione

Builds large, flat nests (up to 2.5 m wide and 1 m deep) made of sticks, grass, and dung, typically in the thorny crowns of acacia trees or other flat-topped trees, 2-7 meters above the ground. Nests are often reused and enlarged over successive years.

Dimensione della covata

1-3 eggs

Descrizione dell'uovo

1-3 (usually 2) oval, dull white or pale greenish-blue eggs, sometimes speckled with reddish-brown. Average size is about 78 x 56 mm.

Periodo di incubazione

45-50 days, primarily by the female, though the male may assist.

Periodo di involo

65-80 days. Young remain in the nest for an extended period, developing their long legs and hunting skills.

Cure parentali

Both parents participate in incubation and feeding the chicks. Chicks are fed regurgitated prey. Parental care continues for several weeks after fledging, with young learning hunting techniques from their parents.

Dove trovarlo

Consigli sul campo

1. Scan open areas. Secretarybirds are often seen walking across open grasslands. Use binoculars to scan the horizon for their distinctive silhouette.
2. Look for elevated perches. While primarily terrestrial, they will perch on trees or termite mounds to survey their territory or roost.
3. Observe hunting behavior. If you spot one, watch its hunting technique. The stomping action is unique and fascinating to observe.
4. Early morning and late afternoon. These are often the best times to observe them actively foraging.

Fatti rapidi

Habitat:

African grasslands and savannas

Diet:

Snakes, lizards, insects, small mammals

Hunting Method:

Stomping prey with long legs

Conservation Status:

Endangered

Distinguishing Feature:

Long legs, black crest, bare orange-red facial skin

Curiosità

• The name 'Secretarybird' is thought to derive from the black crest feathers, which resemble quill pens that 18th-century clerks (secretaries) tucked behind their ears.
• It is the only terrestrial bird of prey in the world, spending almost all its foraging time on the ground.
• Secretarybirds are famous for their ability to hunt and kill venomous snakes, using their powerful legs and quick reflexes to deliver fatal blows.
• Despite their large size, they are surprisingly agile on the ground and can run at considerable speeds.
• The Secretarybird is depicted on the coats of arms of Sudan and South Africa, symbolizing vigilance and protection.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Accipitriformes

Famiglia

Sagittariidae

Genere

Sagittarius

Specie

Sagittarius serpentarius

Esplora Secretarybird