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(species Tragelaphus spekei), aquatic antelope, family Bovidae (order Artiodactyla), found in swamps and marshes of central Africa. The sitatunga swims, dives, and often feeds in the water and hides by submerging almost totally. Its long, spreading hooves and flexible foot joints enable it to walk with ease on soft ground. It attains a shoulder height of about 102 cm (40 inches) and has shaggy hair that is reddish brown in females, grayish brown in males. There is a white mark on the face, two white patches on the neck, and sometimes scattered white stripes on the body. The male has long, spiral horns