Shoebill (Balaeniceps rex): Facts, Bill, Diet and Habitat

What does a shoebill look like?

The shoebill’s most obvious feature is its bill. Seen from the front it is massive, broad and bulbous, pale horn to pinkish with irregular gray blotches, and it ends in a sharp downward hook called the nail. Measured along the top, the bill is about 19–24 cm (7.5–9.5 in) long, one of the longest of any living bird after the pelicans and the largest storks, and it is wider and deeper than either. The edges of the bill are sharp, which helps the bird grip and cut slippery prey.

Adults are slate blue-gray all over, with darker gray flight feathers and a small tuft of feathers at the back of the head. Juveniles are similar but darker, with a brownish tinge. The eyes are large, pale yellow to whitish and face forward, which gives the bird its famous serious stare and lets it judge distance accurately when striking. The legs are long and dark, and the toes are exceptionally long, with a middle toe of about 17–18.5 cm (6.6–7.3 in). Those big feet spread the bird’s weight, so it can stand on floating mats of vegetation that would not support a heron of the same size.

Males and females look alike, although males are on average a little larger.

How big is a shoebill?

The shoebill is one of the tallest wading birds in Africa.

A typical male weighs around 5.6 kg (12 lb) and a typical female around 4.9 kg (11 lb). For a bird so tall, the neck is fairly short and thick, which helps support the heavy head and bill.

Is the shoebill a stork or a pelican?

For most of its scientific history the shoebill was grouped with the storks, and names such as shoe-billed stork and whale-headed stork are still common. The English ornithologist John Gould described the species in 1850 from a skin collected on the White Nile. He gave it its own genus, Balaeniceps, meaning “whale head”, and the species name rex, “king”.

Studies of its skeleton, eggshell structure and, from the 2000s, its DNA have shown that the shoebill is not a stork. It belongs to the order Pelecaniformes, together with the pelicans and herons, and its closest living relative is the much smaller hamerkop of Africa. Like a pelican, it flies with its neck pulled in, and its bill has a strong ridge ending in a hooked nail, a feature shared with the brown pelican and its relatives. The shoebill is the only living species in its family, Balaenicipitidae. Fossil relatives are known from Egypt, about 30 million years old, and from Pakistan and Tunisia.

Its stern face and heavy bill often lead people to call it prehistoric or dinosaur-like. That is true in a sense for every bird, as explained in Are birds dinosaurs?, but the shoebill itself is a modern bird, no older in evolutionary terms than a heron.

Where do shoebills live?

Shoebills live in large freshwater swamps in central East Africa. The largest numbers are found in the Sudd, the vast Nile swamp of South Sudan, and in the wetlands of Uganda. Other important populations live in the Malagarasi wetlands of western Tanzania, the Bangweulu Swamps of northern Zambia, eastern Democratic Republic of the Congo and Rwanda. Scattered records come from neighboring countries such as Ethiopia, Kenya and the Central African Republic.

Their range closely follows two things: papyrus swamps and lungfish. They prefer floodplains with mixed papyrus, reeds and cattails, and channels or pools of open water. Shoebills are often attracted to shallow water that is poor in oxygen, because fish there have to come up to the surface to breathe, where they are easier to catch.

Shoebills do not migrate, but they move locally as water levels and food supply change through the wet and dry seasons. Rock art in the Algerian Sahara suggests that shoebills lived much farther north a few thousand years ago, when the region was wetter.

What do shoebills eat?

Shoebills are carnivores that specialize in large, slippery prey. Their favorite foods are lungfish, especially the marbled lungfish, along with bichirs, tilapia and catfish of the genus Clarias. They also take frogs, water snakes, Nile monitor lizards and young crocodiles, and occasionally turtles, snails, rodents and small waterbirds.

They usually catch much larger prey than other wading birds. In Zambia’s Bangweulu Swamps, fish taken are mostly 15–50 cm (6–20 in) long, and in western Tanzania shoebills regularly catch fish 60–80 cm (24–31 in) long, with a record of about 99 cm (39 in). The details are explained in What do shoebills eat?

How does a shoebill hunt?

Shoebills hunt by sight and with extraordinary patience. A bird stands still at the edge of open water or on floating vegetation, often for many minutes at a time, or wades forward in very slow steps. That stillness has earned it the description “statue-like.”

When a fish rises to breathe, the shoebill strikes in a sudden lunge, often called collapsing: it falls forward with its wings open and drives its open bill down onto the prey, scooping up water and plants as well. It then raises its head, lets the water and vegetation spill from the sides of the bill, and adjusts its grip before swallowing. Studies suggest that roughly 60% of strikes catch something. Handling a large fish can take 10 minutes or more, and very large prey may be cut into pieces with the bill’s sharp edges.

Shoebills hunt alone and keep well apart, usually at least 20 m (66 ft) from each other. Hippos sometimes help by accident: as they move through the swamp, they force fish toward the surface and open channels in dense vegetation.

Behavior and communication

Shoebills are solitary, quiet and slow-moving. They are mostly active by day and spend much of their time standing or slowly stalking. They are also fine fliers: on broad wings they can soar on warm air, and their wingbeat, about 150 flaps per minute, is among the slowest of any bird. Most flights are short, from one feeding area to another.

The main sound a shoebill makes is bill clattering, a loud, rapid rattle of the two halves of the bill like a wooden machine gun. Adults clatter at the nest, in greeting and in courtship, and chicks clatter when begging. Adults have also been heard making a cow-like mooing call and whines, and hungry chicks make sounds remarkably like human hiccups.

Despite their intimidating look, shoebills are calm and do not threaten people, as explained in Are shoebills dangerous? They are, however, very sensitive to disturbance and may abandon a nest if people come too close.

Breeding and chicks

Shoebills nest alone, not in colonies. A pair defends a territory of about 2–4 sq km (0.8–1.5 sq mi). Both parents build the nest, a large, flat mound of grass and other plants on floating vegetation or a small island, about 1–1.7 m (3.3–5.6 ft) across.

The female lays one to three chalky white eggs, and both parents incubate them for about 30 days. On hot days, adults cool the eggs by carrying water in their bills and pouring it over the nest. Both parents feed the chicks by bringing up whole fish into the nest.

Although two or more chicks may hatch, a pair usually raises only one. The oldest, largest chick gets most of the food, and the younger ones often die, acting as a back-up if the first chick fails. Young shoebills leave the nest at about 105 days, fly well at about 112 days and are fed for a month or more afterward. They are thought to reach breeding age at about 3 years.

How long do shoebills live?

The lifespan of wild shoebills is poorly known. Long-lived records of about 35–36 years, including birds kept in zoos, suggest that a shoebill that survives its first years can live for several decades. With few eggs and usually only one chick per nest, populations recover slowly from losses.

Conservation status and threats

The IUCN Red List classifies the shoebill as Vulnerable, with a decreasing population. The total population is estimated at only about 5,000–8,000 birds, most of them in South Sudan, Uganda, eastern DR Congo, Zambia and Tanzania. The species is also listed on Appendix II of CITES, which controls international trade.

The main threats are:

• Habitat loss. Swamps are drained or converted for farming, cattle grazing, dams and development, and dry-season burning destroys nesting areas.
• Disturbance. Fishing, boats and cattle disturb nesting birds, which may abandon their eggs.
• Capture and hunting. Eggs and chicks are taken for food and for the illegal live-bird trade, and adults are sometimes killed.

Protected areas such as Murchison Falls National Park and Mabamba Bay in Uganda and the Bangweulu Swamps in Zambia are key sites. In Bangweulu, local fishers are employed as nest guards, an approach that has helped more chicks fledge safely.

Shoebills and people

Birdwatchers rank the shoebill among the most wanted birds in Africa, and boat trips into Uganda’s Mabamba Swamp and the Bangweulu Swamps of Zambia are popular ways to see one. Since the 2010s, its unblinking stare and habit of standing still have also made it a popular internet meme.

Shoebills are kept in a few zoos around the world, but they are hard to breed in captivity. Successful breeding has been reported at Pairi Daiza in Belgium and at ZooTampa at Lowry Park in Florida, among very few others. Like other large, slow-breeding birds, the shoebill’s future depends on protecting the swamps it needs. Learn about another long-legged fish hunter in our profile of the great blue heron.