The Hammerhead is in Africa usually called the Hammerkop (Scopus umbretta). Its name is also spelled Hamerkop (only one 'm'), reflecting the Afrikaans origin. They're locally common, but sometimes hard to spot because of vegetation surrounding their habitat. Along the shores of Lake Malawi, where this picture was taken, they are common and wade in the shallows at dawn and dusk.
"...the bird which has a special place in an older African history." Redmond O'Hanlon