An endangered giant sea turtle rarely found north of Mexico washed up alive on Stinson Beach after drifting possibly thousands of miles.
The rare olive ridley turtle was first spotted Nov. 25 in the Sea Drift area of the beach. The 60-pound female with a 2-foot-long shell was taken to the Marine Mammal Center in the Marin Headlands, where it was stabilized with fluids, vitamins and antibiotics.
"This is definitely a rare find, one of only three live olive ridley turtles I know of reported in the scientific literature since 2001 along the Central California coast," said Todd Steiner, a biologist and executive director of the Sea Turtle Restoration Project in Marin County.
Steiner said the turtle was suffering from what is known as cold-stunning, a state of suspended animation that can allow a turtle to survive for months in cold water. The big green reptile was covered with algae, barnacles, shore crabs and ghost shrimp, indicating it had been floating for a long time.
"I don't know if it would have had enough strength to get back into the water," Steiner said. "It would have died on a cold night if it didn't get back in the water."
Olive ridleys, whose shells can grow to 2? feet long and which can reach 100 pounds, are one of seven species of giant sea turtle, but their extraordinary nesting habits separate them from the others.
During the mating season between July and December, large groups of them gather offshore of nesting beaches in Mexico and Costa Rica.
Then, all at once, they come ashore to lay eggs in what is known in Spanish as an arribada, or arrival.
Their nesting habits have historically made them easy prey. Steiner said ocean voyagers used to collect turtles because they could keep them alive for months without feeding them, giving sailors an endless supply of fresh meat. Starting in the 1960s, as many as 75,000 turtles a year were being killed until laws were passed to prevent the practice. Their numbers were also greatly reduced by development.
Sea-turtle sightings in the San Francisco Bay Area are not unheard of. Steiner, whose organization was instrumental in closing down a sea-turtle slaughterhouse in the state of Oaxaca in 1990 (sea turtles have since been protected in Mexico), said leatherback turtles have been seen in Monterey and around the Farallones.