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Secretarybird

life science Maturity 5-7 Next article →

The secretarybird, known scientifically as Sagittarius serpentarius, is a unique bird of prey.

Secretarybird-pair
Secretarybird-pair

It is endemic to sub-Saharan Africa, meaning it is found nowhere else on Earth. Unlike many other raptors that spend much of their time soaring, the secretarybird is mostly terrestrial. This means it spends the majority of its life walking on the ground. It thrives in open grasslands, savannas, and shrublands like the Karoo. These birds prefer areas where the grass is not too tall. This specific habitat allows them to move easily while hunting for food.

Physically, the secretarybird is an amazing mix of different bird types. It has the eagle-like head and body of a typical raptor. However, it also possesses very long, crane-like legs.

Secretary Bird with open beak
Secretary Bird with open beak

An adult can stand about 1.3 meters tall. Its wingspan can reach up to 2 meters, and it weighs about 3 kilograms on average. The plumage is mostly blue-grey on the upper parts. The crest consists of long, black feathers arising from the nape of the neck. Adults also have a red-orange face that lacks feathers. Their toes are quite short and stout. In fact, they are only about 20% the length of an eagle's toes. Because of this, they cannot grasp objects with their feet like other birds of prey.

This unique anatomy dictates how the secretarybird hunts. Since they cannot grasp prey, they use a different method to catch food. They hunt for insects and small vertebrates on the ground. To kill their victims, they often stomp on them with their powerful legs. They are very active walkers, pacing at a speed of 12 kilometers per hour. On average, they take 120 steps every single minute.

Secretary Bird with open beak
Secretary Bird with open beak

During flight, their appearance changes slightly. Two long central feathers in their tail extend beyond their feet. Their neck also stretches out, making them look more like a stork while they are in the air.

The history of naming this bird is quite complex.

IconesAnimalium00Mill page 73 - Falco serpentarius - Sagittarius serpentarius - Secretarybird
IconesAnimalium00Mill page 73 - Falco serpentarius - Sagittarius serpentarius - Secretarybird

In 1769, the Dutch naturalist Arnout Vosmaer described a live specimen from the Cape of Good Hope. He suggested the name "sagittarius" might come from the bird's gait, which resembles an archer. In 1779, John Frederick Miller provided the first formal scientific name, Falco serpentarius. The name "serpentarius" comes from the Latin word for snake. Later, in 1783, Johann Hermann placed the bird in its own genus, Sagittarius. Some people believe the name "secretary" refers to the black crest feathers. These feathers look like quill pens used by ancient scribes. Others suggest the name comes from the Dutch word "secretaris."

Scientists have spent a long time studying how the secretarybird is related to other birds. For a long time, its place in the tree of life was a puzzle. It was originally placed in the order Falconiformes. However, modern science uses molecular phylogenetic studies to understand these relationships. These studies look at DNA to see how species are connected. In 2008, a large study concluded the secretarybird belongs to the order Accipitriformes. This order includes eagles, hawks, kites, and vultures. The study showed that falcons are actually only distantly related to the secretarybird. A follow-up study in 2015 confirmed these scientific findings.

Reproduction for the secretarybird involves specific behaviors and locations. They form monogamous pairs, which means they stay with one partner. They defend large territories of about 25 square kilometers.

Secretarybird-pair
Secretarybird-pair

Both sexes work together to build a nest. They usually build these nests at the top of dense, thorny trees, such as the Acacia. They typically lay a clutch of one to three eggs. Breeding can happen any time of year, but it often occurs late in the dry season. In years when food is plentiful, all three young birds can survive to the point of fledging.

Despite their impressive nature, secretarybirds face serious challenges. They are currently classed as endangered by the International Union for Conservation of Nature (IUCN). This classification is due to a rapid decline in their total population. The main cause of this decline is habitat destruction. As the grasslands they rely on are lost, the birds struggle to survive.

Emblem of Sudan
Emblem of Sudan

Interestingly, the secretarybird is so iconic that it appears on the coats of arms for both Sudan and South Africa. Protecting their natural environment is essential for the survival of this remarkable species.

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🖼️ Images & Media (4)
File:IconesAnimalium00Mill page 73 - Falco serpentarius - Sagittarius serpentarius - Secretarybird.jpg
IconesAnimalium00Mill page 73 - Falco...
File:Secretarybird-pair.jpg
Secretarybird-pair.jpg
File:Emblem of Sudan.svg
Emblem of Sudan.svg
File:Secretary Bird with open beak.jpg
Secretary Bird with open beak.jpg
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