Status Least Concern
Size 50-56cm tall
Gestation 28-32 days
Young 3-6 eggs are laid
Life span Around 20 years
The hamerkop’s diet is largely comprised of amphibians, especially frogs and tadpoles, and small fish. They also eat worms, insects and crustaceans such as shrimp.
Hamerkops occur throughout most of tropical Africa, Madagascar and south west Arabia. They are found in a range of habitats, ranging from forest to semi-desert, though they always live close to water. They are most often found in wetland areas of savannah and woodland. They forage in shallow water, and require trees for nesting and roosting.
These birds build enormous, complex nests. The nests are usually built high up in the fork of a tree, but are sometimes on a cliff or even on the ground. Hamerkops will spend 3 to 6 weeks creating their nests, and the reason why they spend so much time and energy building such elaborate nests is unknown. 3 to 6 eggs are laid in a central chamber within the nest, which is accessed by a small opening below the nest. The young fledge between 44 and 50 days old.
Hamerkops don’t currently face any major threats. They are thought to be protected from persecution because they are regarded with great respect and superstition. They may actually be benefitting from the creation of wetlands such as ponds, paddy fields and dams, which has increased their habitats for feeding. They face potential threats from the over use of pesticides which affects water quality.
Hamerkops are reported to be the source of more legends and superstitions than any other bird.
Hamerkop nests are so strong that they can support the weight of a heavy man! They can reach up to 100 times the body weight of the bird.
The roof of hamerkop nests are often topped off with a wide assortment of materials, from bits of skin and bone to paper, plastic, clothing and general rubbish.
Many animal species make use of hamerkop nests. Some animals such as Verreaux’s eagle owls and barn owls may take over the nest, preventing the hamerkops from using it. Other species such as Egyptian geese, comb ducks and grey kestrels will use old nests, and genets, mongoose, pythons and monitor lizards have also been known to use them for resting and sleeping in.
The volunteering day was well organised and a great opportunity to give back to Marwell and offer a little help. We all had a great day and most definitely be back to help where we can, also recommend to anyone else who can offer their time. Paul, SSE, 23rd May 2018