Exuma is home to two extensive national parks. The Exuma Cays Land and Sea National Park is an ecological preserve and wildlife refuge, where you can feed the endangered Bahamian iguanas or catch a glimpse of the elusive hutia with the assistance of one of the professional guides. The marine environs of Moriah Harbour Cay National Park are a vital part of the ecosystem between Great Exuma and Little Exuma. It has a variety of bird life and its mangroves help protect the marine life that sustains the local fishing industry. Other ecological wonders in Exuma include the phenomenal sandbars peering from the shallow waters at low tide, Thunderball Grotto, where you can swim through a large rock and then see the sky, the Blow Hole at Boise Cay with a 10-foot geyser, and Dripping Cave at Guana Cay, with stalactites and stalagmites and no obvious source for where the dripping water is coming from.