ACH SEH ISLAND, Cambodia (AP) — A 7-inch creature with a head resembling a horse and a monkey-like tail glides gracefully out of a dark coral crevice off the Cambodian coast. Master of camouflage, unrivaled as a hunter and a much-loved figure of ancient myths and legends, the seahorse may be spiraling toward annihilation after surviving beneath the waves for some 40 million years….