Kemp's ridley turtle | WWF

Kemp's ridley turtles can claim the unenviable title of the most endangered of all sea turtles. The species has a restricted range and nests only along a small stretch of coastline in the Gulf of Mexico.

© / Solvin Zankl / WWF

Kemp's ridley turtle (Lepidochelys kempii), Mexico. rel= © WWF / Carlos Drews

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Common name
Common Name

Kemp's ridley, Atlantic Ridley, Gulf Ridley, Mexican Ridley; Lépidochelyde de Kemp, Ridley de Kemp, Tortue de Kemp (Fr); Cotorra, Tortuga Lora, Tortuga marina bastarda (Sp)



IUCN: Critically Endangered (CR A1ab) CITES: Appendix I CMS listing: Appendix I and II

Latin name

Scientific Name

Lepidochelys kempii

Population 2


Approx. 1,001-10,000 nesting females

A species back from the brink?

In the 1940s, more than 100,000 Kemp's ridley turtles came ashore in a single day to nest. By the 1980s, numbers were down to a few hundred nesting females. This species does not appear to migrate across open oceans but juveniles move up and down the east coast of the USA between feeding and nesting grounds.

Conservation efforts led by USA and Mexico have been ongoing since the 1970s, when the nesting beach of Rancho Nuevo was declared a National Reserve. These efforts have been relatively successful and today there is a female breeding population of between 1,001 and 10,000 individuals.
    © Terry Ross
Kemp's ridley turtle hatchling, Padre Island National Seashore, US
© Terry Ross

Physical Description

The species differs from the olive ridley by its parrot-like beak and flatter, almost completely round, carapace.


Ridley turtles are around 70cm long, and up to 40kg in weight.


The carapace (shell) of Kemp's ridley is olive grey, while the plastron (underside) is yellowish/white.

Life Cycle

Adult females migrate hundreds or even thousands of kms between feeding habitats, mating areas and their preferred nesting beach in Rancho Nuevo, Tamaulipas, Mexico. Adult males appear to be nonmigratory, and stay mainly in coastal waters around Rancho Nuevo.


Having reached sexual maturity at around 12 years of age, the nesting takes place during daylight along a single stretch of coastline in the Gulf of Mexico. Like olive ridleys, this species nests in arribadas -'mass arrival' in Spanish.

Kemp's ridleys are thought to nest every 2 years, with approximately 3 clutches of about 90 eggs in one season. Incubation lasts about 45 days, and the nesting season extends from March to August, with a peak in May and early June.

Characteristically, ridleys camouflage their nests by rocking from side to side after covering the nest, in order to compact the sand and disguise the nest.


Kemp's ridleys are carnivores, although the feeding behaviour of the hatchlings and juveniles is not well understood. Adults eat crabs, shrimp, clams, and sea urchins. Juveniles eat small species of crabs, but prefer larger species as they mature.

Major habitat type
Shallow sand and mud, estuaries

Biogeographic realm

Range States
Mexico, U.S.

Geographical Location
Gulf of Mexico, western Atlantic

Ecological Region
Greater Antillean Marine, Mesoamerican Caribbean Reef

    © Terry Ross
Kemp's Ridley Hatchlings
© Terry Ross

What are the main threats?

The main threats which affect marine turtles are:
  • Habitat loss and degradation
  • Wildlife trade
  • Collection of eggs and meat for consumption
  • Incidental capture (bycatch)
  • Climate change
  • Pollution

Various factors caused the decline of this species, including near-total exploitation of eggs, slaughter of adults for meat by local people, and fisheries bycatch during shrimp trawling. Today, fishing nets and gear may be its biggest threat yet.

Nests of the Kemp's ridley are shallow and poorly disguised, making them relatively easy for human and non-human predators to find. Animals such as coyotes, skunks, and racoons predate the nests, and ghost crabs, gulls, and other sea birds prey on the hatchlings. In addition, this species is locally threatened by pollution.

Kemp's ridley turtle is a priority species. WWF treats priority species as one of the most ecologically, economically and/or culturally important species on our planet. And so we are working to ensure such species can live and thrive in their natural habitats.

Why is this species important?

Marine turtles fulfill important roles in marine ecosystems
Kemp's ridley turtles feed on invertebrates and may play important roles in both open ocean and coastal ecosystems.

What is WWF doing?

WWF works to protect marine turtles throughout the world through specialist programmes and regional projects devoted to the conservation of marine turtles.

This includes:

  • Action to address the impacts of climate change.
  • Monitoring the migration patterns of marine turtles.
  • Improving and supporting trade controls.
  • Protecting nesting sites.
  • Reducing bycatch and promoting smart fishing.

How you can help

Make a donation


Did you know?

  • Nesting of this species occurs conspicuously in broad daylight, and apart from sporadic nesting elsewhere, takes place only on one 20km beach at Rancho Nuevo in Mexico, on the Gulf of Mexico.
  • Kemp's ridley turtle is the smallest of all the marine turtle species.