Loggerhead sea turtle
A widespread sea turtle with a vulnerable conservation status.
Wikipedia / Wikimedia Commons
The loggerhead sea turtle (Caretta caretta) is a species of sea turtle distributed throughout the world. It is a marine reptile belonging to the family Cheloniidae, and is the world's largest hard-shelled turtle. The loggerhead is considered a vulnerable species by the International Union for Conservation of Nature and is protected under the Endangered Species Act of 1973, with commercial international trade prohibited by CITES Appendix I.
- average weight
- 135 kg (298 lb)
- average carapace length
- 90 cm (35 in)
- lifespan
- 47–67 years
- sexual maturity
- 17–33 years
- conservation status
- Vulnerable (IUCN)
- known for
- largest hard-shelled turtle; powerful jaws; low reproductive rate
Lore & Background
The loggerhead sea turtle was first given its binomial name, Testudo caretta, by Carl Linnaeus in 1758. The combination Caretta caretta was introduced in 1873 by Leonhard Stejneger. The English common name 'loggerhead' refers to the animal's large head. The loggerhead belongs to the family Cheloniidae, which includes all extant sea turtles except the leatherback. Subspecific classification is debated, but most authors consider it a single polymorphic species. Molecular genetics has confirmed hybridization with Kemp's ridley, hawksbill, and green sea turtles, with second-generation hybrids reported, suggesting some hybrids are fertile.
Reader's Guide
The loggerhead sea turtle is significant as a globally distributed marine reptile that plays a role in ocean ecosystems as an omnivorous predator of bottom-dwelling invertebrates. Its large and powerful jaws allow it to dismantle prey effectively. The species has a low reproductive rate, with females laying an average of four egg clutches and then producing no eggs for two to three years. The greatest threats to loggerheads include loss of nesting habitat due to coastal development, predation of nests, human disturbances such as coastal lighting, and untended fishing gear. Turtle excluder devices have been implemented to reduce mortality from fishing trawls. The species' conservation requires international cooperation because loggerheads roam vast ocean areas and critical nesting beaches are scattered across several countries. The distinct populations of loggerheads have unique characteristics and genetic differences; for example, Mediterranean loggerheads are smaller on average than Atlantic Ocean loggerheads.
Did You Know?
- The loggerhead sea turtle is the world's largest hard-shelled turtle.
- Adult males have thicker tails and shorter plastrons than females.
- The loggerhead has a lifespan of 47–67 years.
- Untended fishing gear is responsible for many loggerhead deaths.
Frequently Asked Questions
What is the Loggerhead sea turtle?
The Loggerhead sea turtle (Caretta caretta) is a marine reptile in the family Cheloniidae, found in warm seas across the globe. It holds the distinction of being the largest hard-shelled turtle species on Earth.
What physical traits make the Loggerhead sea turtle stand out?
Loggerheads are built for crushing, with exceptionally powerful jaws that let them tackle hard-shelled prey like crabs and mollusks. Their average carapace reaches about 90 cm in length, and adults typically weigh around 135 kg.
How long do Loggerhead sea turtles live, and when do they start reproducing?
A Loggerhead can live roughly 47 to 67 years, but it takes an astonishing 17 to 33 years before an individual reaches sexual maturity. This extremely long path to adulthood contributes to the species' low reproductive output.
What is the Loggerhead sea turtle's conservation status?
The IUCN lists the Loggerhead as Vulnerable, and the species is shielded under the U.S. Endangered Species Act of 1973. Commercial international trade in Loggerheads is banned through CITES Appendix I.
Why is the Loggerhead sea turtle considered at risk?
Beyond habitat loss and bycatch, the Loggerhead's slow life history—decades to maturity and few offspring per nesting season—makes population recovery painfully slow. Its wide distribution across many jurisdictions also complicates coordinated conservation efforts.
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