PORT ELIZABETH, South Africa (AP) - Marine wildlife experts were mystified Sunday by the mass beaching of 28 dolphins, whose carcasses were found on an isolated shore. "We go regularly to get one or two (beached dolphins), but it's really unusual for a whole lot to strand themselves at the same time at the same place," said Sandy Thackeray, spokeswoman for the Bayworld Oceanarium in the Indian Ocean City of Port Elizabeth. Thackeray accompanied a group of scientists and volunteers who found the dolphins on a long stretch of white sandy beach in the Woody Cape Nature Reserve, near the Indian Ocean city of Port Elizabeth. The dolphins had been on the oceanside beach for several days and were dead by the time the group arrived.