The Hamerkop - Scopus umbretta - is the sole member of its family and is so different that it is one of the really
iconic species of Africa south of the Sahara. In
terms of taxonomic uniqueness the Hamerkop is equal in rank to the Shoebill! The shape of its head with a black, long,
flat, and slightly hooked bill, a crest at the back of the head is reminiscent
of a hammer. Its plumage is a drab brown with purple iridescence on the back.
Its tail is short and its wings are big, wide, and round-tipped.
The Hamerkop
occurs in Africa south of the Sahara, Madagascar
and coastal southwest Arabia in wetland
habitats, including irrigated land, as well as in savannas and forests. Most
Hamerkop remain sedentary in their territories.
Vocalizations
include cackles and a shrill call given in flight. Hamerkops are mostly silent
except when in groups.
Hamerkop feed during
the day and normally feed alone. They feed mainly on amphibians such as Platanna
frogs and other frogs. Other food consists of small fish, shrimp, rodents and
insects. Hamerkop use a variety of foraging techniques, such as wading through
the water and stabbing/grabbing prey, still-hunting at the water's edge or
pouncing on prey from the air.
The Hamerkop's
behavior is unlike any other bird. One unusual feature is that up to ten birds
join in "ceremonies" in which they run circles around each other, all
calling loudly, raising their crests, fluttering their wings. Another is
"false mounting", in which one bird stands on top of another and
appears to mount it, but they may not be mates and do not copulate.
There are many
legends about the Hamerkop. It is known in some cultures as the lightening bird,
and the Bushman believe that being hit by lightning resulted from trying to rob
a Hamerkop's nest. They also believe that the inimical god Khauna would not
like anyone to kill a Hamerkop. According to an old Malagasy belief, anyone who
destroys its nest will get Leprosy and a Malagasy poem calls it an "evil
bird". Such beliefs have given the bird some protection.
The strangest
aspect of Hamerkop behavior is the huge nest it builds. When possible, they
build the nest in the fork of a tree, often over water. A pair starts by making
a platform of sticks held together with mud, then builds walls and a domed roof.
A mud-plastered entrance 13 to 18 cm wide in the bottom leads through a
tunnel up to 60 cm long to a nesting chamber big enough for the parents
and young. The nest is usually built by both sexes, with construction taking
anything from 40-43 days to several months. Other animals often usurp the nest
of the Hamerkop, such as bees, reptiles and other birds, including Owls and
Egyptian Geese.
These birds are
compulsive nest builders, constructing 3 to 5 nests per year whether they are
breeding or not. At the finished nest, a pair gives displays similar to those
of the group ceremonies and mates, often on top of the nest.
The breeding season
is almost year-round, peaking from July to January in South Africa.
The clutch consists of 3 to 7 white eggs and are incubated for between 26 and
30 days by both sexes. Both parents feed the young, often leaving them alone
for long periods. The young hatch covered with gray down. By 17 days after
hatching, their head and crest plumage is developed, and in a month, their body
plumage. They leave the nest at 44 to 50 days but roost in it at night until
about two months after hatching.
The status of the
Hamerkop has changed dramatically in the past two decades, and is now a species
of real conservation concern.
These Iconic
birds can be seen on the following Aves Birding Tours/Safaris/Adventures: -
Aves Arid Birding
Tour / Safari /Adventure.
Aves Eastern Cape Birding
Tour / Safari /Adventure.
Aves Highlands / Tembe Birding Tour / Safari /
Adventure.
Aves KZN Birding
Tour / Safari / Adventure.
Aves North East
Birding Tour / Safari / Adventure.
Aves North West Birding Tour
/ Safari / Adventure.
Aves Western Cape Birding
Tour / Safari / Adventure.
Aves West Coast
Birding Tour / Safari /Adventure.