Reptiles
Olive Ridley Turtle
Lepidochelys olivacea · also called Pacific ridley turtle
Along the coast of Odisha in India, tens of thousands of olive ridley turtles emerge from the sea within the span of just a few nights, an arribada so large it briefly turns an entire stretch of beach into a dense field of nesting turtles before the ocean reclaims them again.
Overview
The olive ridley turtle, Lepidochelys olivacea, is a widely distributed sea turtle found across tropical waters of the Pacific, Indian, and Atlantic Oceans. Its enormous synchronized mass nesting events, among the largest reproductive gatherings of any reptile, make it one of the most visually striking sea turtle species to observe.
Safety and risk in numbers
While the olive ridley turtle’s mass arribadas concentrate an enormous number of individuals in one place at one time, that same concentration exposes migrating turtles to significant fishing bycatch risk along the way, keeping the species vulnerable despite its comparatively large global population.
Status
Vulnerable — relatively numerous compared with other sea turtles, but still declining in parts of its range due to bycatch, egg collection, and coastal development pressures.
Olive Ridley Turtle: common questions
What is special about how olive ridley turtles nest?
The olive ridley turtle is known for participating in large-scale synchronized mass nesting events called arribadas, during which tens of thousands of females can come ashore to nest on a single beach within just a few nights, one of the most dramatic reproductive spectacles found among any sea turtle species.
Is the olive ridley turtle related to the Kemp's ridley turtle?
Yes, the olive ridley turtle and the Kemp's ridley turtle belong to the same genus, Lepidochelys, and are similar in overall size, though the olive ridley turtle is distributed much more broadly across tropical waters of the Pacific, Indian, and Atlantic Oceans, while the Kemp's ridley turtle is far more geographically concentrated.
Why is the olive ridley turtle still at risk despite being relatively numerous?
Large numbers of olive ridley turtles migrating to synchronized nesting beaches can face significant bycatch risk from fishing operations along their migratory routes, and combined with egg collection and coastal development pressures at nesting beaches, this keeps the species classified as Vulnerable despite its relatively large overall global population.
Where can you find major olive ridley turtle nesting sites?
The olive ridley turtle has several particularly well-known mass nesting beaches, including sites along the coast of Odisha in India and beaches in Costa Rica, where major arribada events draw thousands of nesting females along with significant scientific and conservation attention each year.