FaunaHub

Hamerkop (Scopus umbretta)

BirdWetlandAfrica

Hamerkop (Scopus umbretta), a brown wading bird with a hammer-shaped head.

Hamerkop (Scopus umbretta).

Image: Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons.

Overview

The hamerkop (Scopus umbretta) is a medium-sized, all-brown wading bird of Africa (and Madagascar and parts of Arabia), instantly known by the shape of its head: a stout bill and a backward-pointing crest together form a hammer-like silhouette, which gives the bird its Afrikaans name (“hammerhead”). It is the only species in its family.

Modest-looking though it is, the hamerkop is a remarkable architect — it builds an enormous, domed stick nest that is among the largest and most elaborate structures made by any bird.

Note: details here cover the hamerkop as a whole; treat general statements as approximate and verify against authoritative sources.

Habitat & Range

Hamerkops live across most of sub-Saharan Africa, plus Madagascar and southwestern Arabia, in a wide range of wetland habitats — riverbanks, marshes, lake edges, estuaries, rice paddies, and even roadside ditches and dams. They are adaptable and common wherever there is shallow water for feeding and trees for nesting.

Diet

Hamerkops are carnivores that hunt in shallow water, feeding especially on amphibians (frogs and tadpoles) and small fish, plus invertebrates and the occasional small reptile. They forage by walking through the shallows, stirring up prey with their feet or making short dashes and stabs, often near where larger animals have disturbed the water.

Behavior

The hamerkop's most famous behaviour is its nest-building. A pair constructs a massive domed nest of sticks, mud, and all sorts of gathered material — often more than a metre across and strong enough to bear a person's weight — with a small entrance leading to an inner chamber. A pair may build several huge nests in a year, and abandoned nests are used by many other animals. Hamerkops also perform curious social displays in which groups gather, call, and run around one another.

Human Interaction & Conservation

Hamerkops are common and adaptable, often living close to people around farm dams and wetlands, and their giant nests are a familiar sight. They feature in the folklore of some African cultures, sometimes regarded with superstition. The species is widespread and not generally of conservation concern. Consult authoritative sources for current status.

More photos of the hamerkop

A hamerkop catching a fish at the water's edge.

Hamerkop (Scopus umbretta) feeding.

Image: Andy Morffew, CC BY-SA 4.0, via Wikimedia Commons.

Frequently Asked Questions — Hamerkop

Why is it called a hamerkop?
The name is Afrikaans for 'hammerhead.' When the bird holds its head with the stout bill pointing forward and the crest pointing back, the silhouette looks like a hammer. This distinctive head shape is the easiest way to recognise the hamerkop.
How big is a hamerkop's nest?
Enormous. A hamerkop pair builds a huge domed nest of sticks and mud that can be well over a metre across and strong enough to support a person's weight, with a small entrance into an inner chamber. It is one of the largest and most elaborate nests built by any bird, and pairs may make several in a year.
What do hamerkops eat?
They are carnivores that hunt in shallow water, especially for amphibians like frogs and tadpoles, plus small fish, invertebrates, and occasional small reptiles. They forage by walking through the shallows and stirring up or dashing after prey.
Are hamerkops rare?
No — hamerkops are widespread and common across sub-Saharan Africa, Madagascar, and parts of Arabia, and they adapt well to human-made wetlands like farm dams and ditches. They are not generally considered of conservation concern, though local status should be checked against authoritative sources.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.