Pacific Leatherback Turtle is the heaviest turtle in the world with 865 kg or 1908 lbs of weight. Named for its smooth, leathery skin, the leatherback has graced ocean waters from the tropics to the Arctic since the time of the dinosaurs more than 100 million years ago. This type of turtules is going to extinct till 2014, according to a report released at the 24th Annual Symposium on Sea Turtle Conservation and Biology.

Atlantic Leatherback Turtles are the second heaviest turtles in the oceans on the earth. The average weight of Atlantic Leatherback turtles is 454 kilo or 1,000 lbs. Atlantic turtles are also one of the rarest turtles in the world. Scientists say that the population of these turtles have dropped drastically since 1982 i-e 97%. They are also under threat of extinction.

Green Sea Turtles are the third heaviest turtles on earth. The average weight of these turtles is about 408 kg. or 900 lbs. Green sea turtles are reptiles whose ancestors evolved on land and returned to the sea to live about 150 million years ago. They are distinguished by the scales on their skin. Only 200,000 nesting females have been left behind while most of the population have fell prey to hunting, coastal development and habitat degradation. They are mostly found on French Frigate Shores.

Loggerhead Turtle is the fourth heaviest of all the turtle species in the world. Their average weight is about 368 kb or 850 lbs. and measures about 3 feet in length. It is mostly found in United States Of America, commonly in Florida. This type of turtles is also facing a severe threat of extinction from the face of the earth. They feed on bottom dwelling invertiberates.

Alligator Snapping Turtle is a prehistoric-looking alligator snapping turtle which is the largest freshwater turtle in North America and among the largest in the world. With its spiked shell, beaklike jaws, and thick, scaled tail, this species is often referred to as the “dinosaur of the turtle world. It is the fifth largest turtle in the world with average weight of 183 kg or 403 lbs.

Black Sea Turtles nest on the beaches of the west coast of the Americas and are considered as the subspecies of Green Sea Turtles. They feed mostly on seagrass, invertebrates, algae and jellies. Female sea turtles may travel thousands of miles to return to their nesting site to lay eggs. Because of 126 kg or 278 lbs of weight it is considered as the sixth heaviest turtle in the world. Their habitat ranges from tropical Eastern Pacific, from central Baja California to Peru.

Flatback Turtles are quite special Australians, as this species only breed on beaches and islands of northern Australia. Flatback turtles nest on sheltered, often muddy beaches of Western Australia. They are among the heaviest turtles in the world with 84 kg or 185 lbs of weight. Therefore they are ranked as the seventh heaviest in the world. The eggs of flatback turtles are eaten by dingos and introduced foxes therefore its population is decreasing with the time.

Hawksbill Turtle weighs about 68 kg or 150 lbs making it the eigth heaviest turtle in the world. It is mostly found in Gulg Of Mexico, Caribbean and United State’s coastal areas. Spongers are the principal diet of Hawkbill turtles. They are also under a severe threat of extinction due to several human as well as ecological activities.

Kemps Ridley turtle is the ninth heaviest and one of the most endangered turtle species in the world. The big threat to the kempi today is no longer the coyotes or egg hunters that brought about the original decline. The factor to reckon with now is incidental catch by shrimp trawlers. With the breeding population down to no more than twelve hundred mature females, each turtle caught by a net dragged for other species represents a significant loss. Average weight of kemps Ridley turtle is 50 kg or 110 lbs.

Olive Ridley Turtle is the last in this list of the most heaviest turtles and the most endangered turtles in the world. The average weight Olive Ridley turtles is 50 Kg or 110 lbs.