CAPE TOWN, South Africa — Fifty years ago, Banhine National Park in Mozambique was a wildlife haven, teeming with herds of giraffe, buffalo and antelope. Then, it was stripped nearly bare by decades ...

For a man who spent his life studying the movements of wildlife, Roberto Zolho was most at peace when not moving at all—drifting in a kayak down the Guacheni channels, pausing to admire an egret, a ...