The secretarybird, or secretary bird (Sagittarius serpentarius), is a large bird of prey that is endemic to Africa. It is mostly terrestrial, spending most of its time on the ground, and is usually found in the open grasslands and savanna of the sub-Saharan region. The species was described by John Frederick Miller in 1779, and its official common name was designated by the International Ornithologists' Union.
The secretarybird is instantly recognizable as a very large bird with an eagle-like body on crane-like legs that give the bird a height of as much as 1.3 m (4 ft 3 in). The plumage of the crown, upperparts, and wing coverts is blue-grey, and the underparts are lighter grey to grey-white. The crest is made up of long, black feathers arising from the nape, while the face is featherless and red-orange with pale brown irises and a yellow cere. The legs are pinkish-grey with black feathers on the upper legs, and the toes are short and stout, making grasping difficult for the feet.
Secretarybirds are primarily ground-dwellers. They hunt on foot and frequently stomp on prey to kill it, a distinctive hunting method that suits their open-habitat lifestyle. Their long legs are nearly twice as long as those of other ground-dwelling birds of similar mass, an adaptation that facilitates their unique stomping and striking technique. When on the hunt, they may flush prey from tall grass by stomping the surrounding vegetation, and their crest feathers can rise to help shade the face and aid in visual targeting.
In terms of behavior, secretarybirds form monogamous pairs and defend large territories, typically around 50 km2 (19 sq mi). They can breed at any time of the year, though breeding is more common in the late dry season. Both parents participate in nest building and incubation, with the nest typically placed at the top of a dense thorny tree, often an Acacia, at a height between 2.5 and 13 m (8 and 40 ft) above the ground. The nest is a relatively flat platform of sticks, about 1.0-1.5 m (3-5 ft) across and 30-50 cm (12-20 in) deep. A clutch of one to three eggs is laid at 2- to 3-day intervals, and the eggs are elongated, chalky bluish-green or white, averaging 78 mm × 57 mm (3.1 in × 2.2 in). Both parents incubate, with the female typically staying on the nest overnight.
The secretarybird’s diet is remarkably diverse and primarily terrestrial, consisting of insects (locusts, grasshoppers, wasps, beetles), millipedes, spiders, scorpions, and freshwater crabs, but small vertebrates often form the main biomass. Prey can include rodents, frogs, lizards, small tortoises, eggs, and birds, with occasional larger mammalian prey such as hedgehogs, mongooses, cheetah cubs, gazelles, and hares. Snakes are also part of the diet, though earlier impressions overstated their importance. The bird’s hunting strategy-stomping to immobilize prey-often applies to lizards and snakes, and is supported by its long legs and powerful, rapid kicks. A secretarybird can strike with a force several times its own body weight, delivering swift blows to the head of the prey in a fraction of a second, relying on precise visual targeting.
Physically, the secretarybird’s wings are capable of powerful flight, though they are used primarily for travel between hunting grounds or roost sites. In flight, two elongated central tail feathers extend beyond the feet, and the neck stretches out like a stork. The head and neck appear elongated in flight, matching its crane-like leg posture. Adults are typically silent, but may utter deep, guttural croaks during nuptial displays or at nests; alarm calls can be high-pitched croaks. The face remains bare, with a striking red-orange color, and the overall plumage gives the bird a regal, raptor-like appearance paired with crane-like locomotion on the ground.
The secretarybird inhabits a broad elevation range-from coastal plains to highlands-and preferentially selects open grasslands, savannas, and shrublands over forests or dense shrubbery. Grass height also influences distribution: areas with grass under about 0.5 m (1 ft 8 in) are preferred, while taller grass (>1 m) is avoided. While not generally gregarious, individuals can be seen in pairs or family groups, and roosting often occurs in Acacia or Balanites trees, or even introduced pines in some regions. Daily activity typically starts after dawn with preening, and birds may move in pairs or small groups during foraging before retreating toward roost sites at dusk.
Despite a wide range, the secretarybird faces a rapidly declining population, largely due to habitat destruction, and is currently classified as endangered by the IUCN. Its status has spurred interest in cultural symbolism and conservation efforts, as the secretarybird is an emblematic species on national coats of arms, notably representing growth and the protection of states against enemies in South Africa’s emblem and appearing on the emblem of Sudan as well. Its evolutionary history has been the subject of debate, initially placed in its own family Sagittariidae within Falconiformes, then reinterpreted through molecular phylogenetics to be sister to a clade containing Pandionidae (ospreys) and Accipitridae (kites, hawks, and eagles). The earliest fossil records associated with the family come from the genus Pelargopappus in the Oligocene and Miocene of France, suggesting primitive features shared with Accipitridae in the feet.
In captivity, secretarybirds have been successfully bred, with the first documented successful rearing occurring in 1986 at the Oklahoma City Zoo. A recent captive hatching occurred in 2024 at Longleat Safari Park. The combination of a striking appearance, specialized cursorial hunting strategy, and cultural significance continues to make the secretarybird a compelling subject for study and conservation.
Key adaptations and hunting behavior
Central to the secretarybird’s ecology is its remarkable stomping technique. The bird uses its long legs to stalk through grasslands, flushing prey and delivering powerful blows with its strong feet. This method is particularly effective against lizards and snakes, for which the bird has evolved to deliver rapid foot strikes. When larger prey is encountered, the bird can use its beak to manipulate smaller items, but most food is swallowed whole through its wide gape. The long legs also facilitate speed and stepping coverage, though they can reduce running efficiency over uneven terrain.
In terms of sensory capabilities, secretarybirds are believed to have large, frontal, binocular vision enabling precise targeting during fast strikes. Their tail and neck anatomy support streamlined movement during flight, while the crest and facial bare skin play roles in signaling during courtship and territorial displays. Vocalizations are typically limited, but birds can emit croaks during social interactions, threats, or nesting activities.
Reproduction and development
Breeding can occur at any time of the year, but peaks in late dry seasons in many populations. The nest is constructed by both parents at the top of thorny trees, with a platform of sticks across 1.0-1.5 m in diameter and 30-50 cm deep. Clutch size ranges from one to three eggs, with incubation shared between adults; the female often stays on the nest overnight. Egg incubation lasts about 45 days, with hatchings occurring at intervals of 2-3 days. Nestlings emerge gray-white and develop crest feathers by 21 days and flight feathers by 28 days. Fledging occurs around 75-80 days, with juveniles remaining in the natal range for several months before dispersing at 4-7 months of age.
Juvenile secretarybirds grow rapidly, their weight increasing from 56 g at hatch to roughly 3.0 kg by 70 days. The fledglings gradually learn hunting skills and social behaviors, remaining in family groups as they mature. Adults continue to forage and defend territories, occasionally forming loose familial flocks, though most individuals remain near their nesting territories.
Conservation and cultural significance
Although the secretarybird is iconic in African wildlife imagery, its populations are threatened by habitat destruction and human encroachment. It remains a symbol of resilience and pest control in agricultural landscapes while also serving as a national emblem in several countries. The ongoing decline underscores the need for habitat protection and monitoring to ensure this unique archer-like raptor persists in its natural habitat.
In taxonomy, the secretarybird’s placement within Falconiformes has shifted based on molecular data, highlighting the complexities of avian evolution. An early description by Arnout Vosmaer in 1769 and later by Buffon contributed to the common name’s etymology, with historical attributions linking the “secretary” label to the bird’s long neck feathers resembling a quill behind a scribe’s ear. Modern phylogenetics places Sagittarius serpentarius near other raptors, reaffirming its status as a distinct lineage with unique adaptations among diurnal birds of prey.