06/16/2026
For , let's celebrate the Olive Ridley sea turtle! This species is considered "Vulnerable" by the IUCN Red List, their population trend is "Decreasing". On the Pacific Coast of Mexico, breeding populations are listed as "Endangered" and all other populations are "Threatened".
Size: 2-2.5 feet (~0.6 meters)
Weight: 75-100 pounds (34-45 kg)
Diet: Crabs, shrimp, lobster, urchins, jellies, algae, fish
🐢 Olive ridleys nest in arribadas (large groups of sea turtles nesting at the same time) and though arribadas are not well understood, the timing is thought to coincide with weather events such as strong winds or cloudy days, or with moon and tide cycles.
🐢 Olive ridleys are primarily pelagic, spending much of their life in the open ocean, but may also inhabit continental shelf areas and venture into bays and estuaries.
🐢 Adults reach sexual maturity around the age of 15 years.
🐢 Like the Kemp’s ridley, they nest 'in mass’ referred to as arribadas. During arribadas, thousands of females may nest over the course of a few days to a few weeks. They’ll nest 1-3 times per season and lay about 100 eggs per nest. Eggs incubate for roughly 2 months before hatching.
🐢 Olive ridleys occur globally and are found mainly in tropical regions of the Pacific, Indian, and Southern Atlantic Oceans. Arribadas occur in Mexico, Nicaragua, Costa Rica, Panama, Australia, parts of Africa, and a few beaches along the coast of India. The largest ones occur in Costa Rica, Mexico, and India. Other solitary nesting areas include Guatemala, Brazil, Myanmar, Malaysia, and Pakistan. Worldwide, they nest in approximately 40 countries.
🐢 Threats to olive ridleys include the direct harvest of turtles and eggs for human consumption, entanglement of turtles in commercial fishing gear, and coastal development.
Photo credit: NOAA Fisheries, art by Dawn Witherington.