The Leatherback Sea Turtle is unlike any other reptile on Earth—its leathery shell, colossal size, and record-breaking abilities make it one of the ocean’s most extraordinary creatures. Here are some of the characteristics that make the Leatherback one of the most interesting animals in the ocean....
Ancient Giants of the Ocean
- Largest living turtle species: Adult leatherbacks can reach up to 2.4 meters (8 feet) in length and weigh as much as 900 kilograms (2,000 pounds), making them not only the biggest sea turtle but also one of the largest reptiles alive today.
- Prehistoric survivors: Leatherbacks have existed largely unchanged for more than 100 million years, dating back to the time of the dinosaurs.
Unique Shell and Physiology
- Leathery shell instead of hard plates: Unlike other sea turtles, leatherbacks lack a bony shell. Their carapace is covered in oily flesh and tough, rubbery skin, with seven distinct ridges running lengthwise.
- Warm-blooded adaptation: Leatherbacks are the only sea turtles considered warm-blooded. They maintain body heat through a combination of large body size, thick layers of fat, dark coloration, and a countercurrent heat exchange system in their blood vessels.
- Hydrodynamic design: Those seven ridges streamline their bodies, making them powerful long-distance swimmers. Their front flippers can span up to 2.7 meters (9 feet), the largest of any sea turtle.
Masters of Migration
- Global travelers: Leatherbacks are the widest-ranging reptile in the world, found in every ocean except the Arctic and Antarctic.
- Epic journeys: They migrate up to 16,000 km (10,000 miles) annually between nesting and feeding grounds. One tracked turtle swam over 20,000 km from New Guinea to Oregon.
Diving Champions
- Deepest-diving air-breathing reptile: Leatherbacks regularly dive over 1,000 meters (3,280 feet), with a record dive reaching 1,344 meters (4,409 feet).
- Pressure-resistant shell: Their flexible, compressible shell allows them to withstand immense underwater pressure without injury.
Specialized Diet
- Jellyfish specialists: Leatherbacks feed almost exclusively on jellyfish, helping regulate jellyfish populations in marine ecosystems.
- Unique throat spines: Their throats are lined with backward-pointing spines that prevent slippery prey from escaping.
Reproduction and Life Cycle
- Nesting behavior: Females lay about 100 eggs in sandy beach nests. Hatchlings instinctively crawl toward the ocean, though many fall prey to birds, crabs, and fish.
- Long-lived species: Leatherbacks may live more than 50 years, though exact lifespans remain uncertain.
Conservation Status
- Critically endangered: Despite their resilience, leatherbacks face severe threats from plastic pollution (mistaken for jellyfish), fisheries bycatch, habitat loss, and climate change.
- Global decline: Populations in the Pacific have dropped by more than 90% in recent decades, making conservation efforts urgent.