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Florida is Number One in Turtles
Florida is an important place for the endangered and
threatened sea turtles of the world. Sea turtles nest on our beaches,
forage for food in our estuaries, and all too often wash-up dead on our
shoreline. Florida Fish and Wildlife Conservation Commission staff are
dedicated to protecting sea turtles in Florida and learning as much as
possible about the biology and life history of these elusive animals.
Types of Turtles
Florida is an important place for the endangered and threatened sea turtles of the world. Sea turtles nest on our beaches, forage for food in our estuaries, and all too often wash-up dead on our shoreline. Florida Fish and Wildlife Conservation Commission staff are dedicated to protecting sea turtles in Florida and learning as much as possible about the biology and life history of these elusive animals.
Types of Turtles
The powerful jaws of the loggerhead turtle allow it to easily crush the clams, crabs, and other armored animals it eats. A slow swimmer compared to other sea turtles, the loggerhead occasionally falls prey to sharks, and individuals missing flippers or chunks of their shell are not an uncommon sight. However, the loggerhead compensates for its lack of speed with stamina; for example, a loggerhead that had been tagged at Melbourne Beach was captured off the coast of Cuba 11 days later.
GREEN TURTLE (Chelonia mydas)
A more streamlined-looking turtle than the bulky loggerhead, the green turtle weighs an average of 350 pounds and has a small head for its body size. Its oval-shaped upper shell averages 3.3 feet in length and is olive-brown with darker streaks running through it; its lower shell, or plastron, is yellow.
Green turtles are found during the day in shallow flats and seagrass meadows and return every evening to their usual sleeping quarters—scattered rock ledges, oyster bars, and coral reefs. Adult green turtles are unique among sea turtles in that they are largely vegetarians, consuming primarily seagrasses and algae. Approximately 100 to 1,000 green turtles nest on Florida's beaches each year from June through late September.
LEATHERBACK TURTLES (Dermochelys coriacea)
Leatherbacks look distinctively different from other sea turtles. Instead of a shell covered with scales or shields, leatherbacks are covered with a firm, leathery skin and have seven ridges running lengthwise down their backs. They are usually black with white, pink, and blue splotches and have no claws on their flippers. Leatherbacks eat soft-bodied animals such as jellyfish, and their throat cavity and scissor-like jaws are lined with stiff spines that aid in swallowing this soft and slippery prey. Young leatherbacks in captivity can consume twice their weight in jellyfish daily.
True denizens of the deep, leatherback turtles are capable of descending more than 3,000 feet and of traveling more than 3,000 miles from their nesting beach. They are found throughout the Atlantic, Pacific, and Indian oceans, as far north as Alaska and Labrador. Researchers have found that leatherbacks are able to regulate their body temperature so that they can survive in cold waters. The leatherback is found in Florida's coastal waters, and a small number (from 30 to 60 a year) nest in the state.
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More Turtle Types
KEMP'S RIDLEY TURTLE Lepidochelys kempi)
The Kemp's ridley is the rarest sea turtle in the world and is the most endangered. It has only one major nesting beach, an area called Rancho Nuevo on the gulf coast of Mexico. The location of this nesting beach was itself a mystery to scientists until the discovery of a film made in 1947 by a Mexican engineer showing 40,000 Kemp's ridleys crawling ashore in broad daylight to lay eggs. Sadly, an "arribada" (from the Spanish word for arrival) of such awe-inspiring splendor can now be seen only on film. Fewer than 1,000 nesting females remain in the world.
Kemp's ridleys are small, weighing only 85 to 100 pounds and measuring 2 to 2.5 feet in carapace length, but they are tough and tenacious. Their principal diet is crabs and other crustaceans.
During the 1980s, many eggs were removed from the beach at Rancho Nuevo and incubated in containers. The hatchlings that emerged from these eggs were then raised for almost a year in a National Marine Fisheries Service facility in Galveston, Texas. Upon release, it was hoped that these "headstarted" turtles had a better chance of survival than they would have had as hatchlings. Unfortunately, there were many problems with this program. When it was discovered that the sex of turtle hatchlings was influenced by temperature, project workers realized that the artificial egg incubators were producing only male turtles. They also discovered that many of the "headstarted" turtles did not behave like their wild counterparts after release. Many scientists worried that these "headstarted" turtles would never become reproducing adults. Although two "headstarted" turtles have finally been known to nest, headstarting is generally considered to be an inappropriate conservation technique for marine turtles.
HAWKSBILL TURTLE (Eretmochelys imbricata)
Hawksbill turtles weigh from 100 to 200 pounds as adults and are approximately 30 inches in shell length. Its carapace is shaded with black and brown markings on a background of amber. The shields of this kaleidoscopic armor overlap, and the rear of the carapace is serrated. Its body is oval-shaped, its head is narrow, and its raptor-like jaws give the hawksbill its name. These jaws are perfectly adapted for collecting its preferred food, sponges. Although sponges are composed of tiny glasslike needles, this potentially dangerous diet apparently causes the turtle no harm.
Hawksbill turtles are the most tropical of the sea turtles and are usually found in lagoons, reefs, bays, and estuaries of the Atlantic, Pacific, and Indian oceans. They are frequently spotted by divers off the Florida Keys, and a few nests are documented annually from the Keys to the Canaveral National Seashore.
Nesting Sea Turtles
Hatchling Sea Turtles
Some text on this page provided by the Florida Marine Research Institute.