<P> Olive ridleys rarely weigh over 50 kg (110 lb). A study in Oaxaca, Mexico, reported a sample of adults ranged from 25 to 46 kg; adult females weighed an average of 35.45 kg (n = 58), while adult males weighed significantly less, averaging 33.00 kg (n = 17). Hatchlings usually weigh between 12.0 and 23.3 g . </P> <P> Adults are somewhat sexually dimorphic . Mature males have longer and thicker tails, which are used for copulation, and the presence of enlarged and hooked claws on the males' front flippers allow them to grasp the female carapace during copulation . Males also have longer, more tapered carapaces than females, which have round, dome - like carapaces . Males also have more concave plastrons, believed to be another adaptation for mating . The plastrons of males may also be softer than females . </P> <P> The olive ridley turtle has a circumtropical distribution, living in tropical and warm waters of the Pacific and Indian Oceans from India, Arabia, Japan, and Micronesia south to southern Africa, Australia, and New Zealand . In the Atlantic Ocean, it has been observed off the western coast of Africa and the coasts of northern Brazil, Suriname, Guyana, French Guiana, and Venezuela . Additionally, the olive ridley has been recorded in the Caribbean Sea as far north as Puerto Rico . A female individual was found alive on an Irish Sea beach on the Isle of Anglesey, British Isles in November 2016, giving this species its northernmost appearance . It was taken in by the nearby Anglesey Sea Zoo while its health was being assessed . The olive ridley is also found in the eastern Pacific Ocean from the Galapagos Islands and Chile north to the Gulf of California, and along the Pacific coast to at least Oregon Migratory movements have been studied less intensely in olive ridleys than other species of marine turtles, but they are believed to use the coastal waters of over 80 countries . Historically, this species has been widely regarded as the most abundant sea turtle in the world . More than one million olive ridleys were commercially harvested off the coasts of Mexico in 1968 alone . </P> <P> The population of Pacific Mexico was estimated to be at least 10 million prior to the era of mass exploitation . More recently, the global population of annual nesting females has been reduced to about two million by 2004, and was further reduced to 852,550 by 2008 . This indicated a dramatic decrease of 28 to 32% in the global population within only one generation (i.e., 20 years). </P>

Where does the olive ridley turtle come from
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