SAVANNAH — Known for sea turtles nesting on its beaches, wading shorebirds in the surf and white-tailed deer that roam its maritime forests, Jekyll Island has taken extra steps to make sure visitors realize the state park also is home to an abundance of alligators. The Jekyll Island Authority, which manages the island 70 miles south of Savannah, in the last month posted nearly 30 signs at the edge of ponds, alongside ditches and at entrances to its four golf courses. The signs urge visitors to "Be Aware Alligators Are Common in Lakes, Ponds and Ditches" and tell them "Do Not Feed Wildlife," each printed with a gator graphic.