Loggerhead Turtle
Loggerhead Turtle
Loggerhead Turtle
Reptiles · Sea turtles

Loggerhead Turtle

Caretta caretta (Linnaeus, 1758)
syn. Halichelys atra, Testudo caretta, Thalassochelys caretta, Thalassochelys corticata
90 - 125 cm450 kg1-200 mCITES IVulnerable
1023

The loggerhead sea turtle, known scientifically as Caretta caretta, is a marine reptile found across the globe in the Atlantic, Pacific, and 🌊 Indian Oceans, as well as in the Mediterranean Sea. This species is recognizable by its reddish-brown shell and yellow to brown skin. When fully grown, loggerhead sea turtles typically have a shell length of about 90 cm (35 inches), with some individuals reaching lengths up to 125 cm (49 inches). These turtles can weigh over 450 kg (1,000 pounds).

Loggerhead turtles are primarily ocean dwellers, residing in both the open sea and shallow coastal waters. They can be found at depths ranging from 1 to 40 meters (3 to 130 feet), although they are capable of diving as deep as 200 meters (650 feet). Young loggerheads often live among Sargassum algae mats, which serve as both a habitat and a source of food. These turtles prefer water temperatures between 13.3 and 28 °C (56 and 82 °F), with nesting females favoring slightly warmer conditions of 27 to 28 °C (81 to 82 °F).

As omnivores, loggerhead sea turtles feed on a variety of ocean life, primarily consuming bottom-dwelling invertebrates such as gastropods, bivalves, decapods, and horseshoe crabs. They also eat algae, vascular plants, fish, and occasionally hatchling turtles. Loggerheads have strong, robust jaws perfect for breaking down their prey. While juvenile turtles face numerous predators including both terrestrial and marine threats, adult loggerheads primarily contend with large marine predators like sharks.

Loggerhead turtles mature sexually between the ages of 17 and 33 years and can live from 47 to 67 years. Their reproductive behavior includes mating typically occurring during migrations. Females emit special signals to indicate their readiness to mate. After mating, reproduction may result in multiple paternity where offspring in one clutch have different fathers. During nesting, a female will lay an average of four egg clutches and then pause reproduction for two to three years. The nesting process involves the female digging a nest in the sand, laying her eggs, covering them, and returning to the sea.

The loggerhead sea turtle has a significant role in marine ecosystems. By studying their biology, behaviors, and habitats, we can gain critical insights into how to safeguard and preserve this important species for the future.

Why it's threatened

Residential & commercial development
Housing & urban areas · Commercial & industrial areas · Tourism & recreation areas
Biological resource use
Intentional use: (subsistence/small scale) [harvest] · Unintentional effects: (subsistence/small scale) [harvest]
Human intrusions & disturbance
Recreational activities · Work & other activities
Invasive species, genes & disease
Named species
Pollution
Garbage & solid waste · Light pollution
Climate change & severe weather
Habitat shifting & alteration · Temperature extremes · Storms & flooding

Threats to Loggerheads vary in time and space, and in relative impact to populations. Threat categories affecting marine turtles, including Loggerheads, were described by Wallace et al. (2011) as:

Fisheries bycatch: incidental capture of marine turtles in fishing gear targeting other species;Take: direct utilization of turtles or eggs for human use (i.e., consumption, commercial products);Coastal Development affecting critical turtle habitat: human-induced alteration of coastal environments due to construction, dredging, beach modification, etc;Pollution and Pathogens: marine pollution and debris that affect marine turtles (i.e., through ingestion or entanglement, disorientation caused by artificial lights), as well as impacts of pervasive pathogens (for example fibropapilloma virus) on turtle health;Climate change: current and future impacts from climate change on marine turtles and their habitats (increasing sand temperatures on nesting beaches affecting hatchling sex ratios, sea level rise, storm frequency and intensity affecting nesting habitats, etc.).The relative impacts of individual threats to all Loggerhead subpopulations were assessed by by Wallace et al. (2011). Fisheries bycatch was classified as the highest threat to Loggerheads globally, followed by coastal development and human consumption of eggs, meat, or other products. Due to lack of information, pollution and pathogens was only scored as affecting three subpopulations and climate change was only scored for two subpopulations. Enhanced efforts to assess and reduce the impacts of these threats on Loggerheads—and other marine turtle species—should be a high priority for future conservation efforts. More detailed information at regional level can found in the specific subpopulation assessments.

Threat classification from the IUCN Red List.

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Last Update: June 28, 2026