Lunchtime rush: After moving slowly towards a small waterhole for a drink and some relief from the midday heat in drought-stricken Etosha National Park (Namibia), wildebeest, springbok and zebra are suddenly startled into a stampede when they detect two lions waiting quietly in the nearby grass. This cautious approach followed by a startled retreat occurred about six times over a three hour period and no one got a drink nor the lions a meal.