Loggerhead and hawksbill turtles are particularly vulnerable. The loggerhead, Kemp's ridley, olive ridley, and hawksbill sea turtles are omnivorous their entire life. There are four species of sea turtle, the leatherback, loggerhead, Kemp's ridley and green turtle. Nesting beaches of loggerhead sea turtles are protected. Loggerhead sea turtles nest on the sandy beaches. Adult whelks are eaten by loggerhead sea turtles. Sea turtles include the green turtle and the loggerhead turtle which are both threatened species. The threatened green and loggerhead sea turtles nest on the bay's sandy beaches. St. George Island is a known nesting ground for loggerhead sea turtles. Hatchling loggerhead turtles live in floating mats of "Sargassum" algae. Fungi such as "Penicillium" infect loggerhead sea turtle nests and cloacae. Destruction and encroachment of habitat by humans is another threat to loggerhead sea turtles. Loggerhead turtles are known to visit the Bay. The loggerhead sea turtle is omnivorous, feeding mainly on bottom-dwelling invertebrates. It has been documented in loggerhead turtles and likely in prehistoric marine animals as well.