Gavin Loxton has more than 5,000 sheep at the high-country farm he runs in Lake Tekapo, New Zealand, so he said it wasn’t surprising that he didn’t notice when one of his lambs was missing about four years ago. But he definitely noticed when the sheep was found. After several years on the run, the wayward male Merino was discovered on April 14 hiding in an outcropping of rocks on Mount Edward — which has an elevation 6,765 feet — with almost double his weight in wool. Shrekapo, as he was nicknamed by residents of the Lake Tekapo township, had...