National Geographic : 1960 Sep
KODACHROMESBY GEORGETREICHEL (BELOW) , EMIL SCHULTHESS, BLACK STAR (RIGHT), AND BYRON CRATER @ NATIONAL GEOGRAPHICSOCIETY Startled lechwes churn marsh waters in Northern Rhodesia. Before World War II some 250,000 red lechwes roamed the flood plain of the Kafue River; today fewer than 30,000 remain. Aquatic as North American moose, le chwes stand belly deep in water to graze on flooded grasses. During rains the herds venture into woodlands. Ewes bear their young on river islands. By fertilizing plant life in the shallows, lechwes encourage fish to multiply, to the benefit of river tribes. 398 Wary impala ram and his harem stand poised for flight in Amboseli National Re serve, Kenya. When the herd takes off single file through the bush, white-fringed tails and rump stripes will flash signals that keep its members together. If alarmed, they will leap rather than run, rising 10 feet at a bound and appearing to float in mid-air with effortless grace. Impalas remain perpetually on guard against ambush by leopards, lions, and wild dogs. At water holes they prefer the shal lows, where they can spot lurking crocodiles.