Angola; Giant Sable; Wildlife. In A Certain Curve of Horn, veteran journalist John Frederick Walker tells the story of the giant sable, weaving an enthralling epic of exploration and adventure, politics and war, bringing to life the brutal realities of today's Africa and the bitter choices of conflicting conservation strategies. Walker takes the reader on a quest from the giant sable's place in the hunting myths of the Songo and Lwimbi peoples, through the coming of Portuguese colonization in the fifteenth century, the animal's discovery by British railway engineer H.F. Varian in 1916, the horrific six-nation conflict that followed Angolan independence to the current controversial effort to restock a vast wildlife park in coastal Angola that may become the noble antelope's new home.