Endangered Olive Ridley sea turtle species nesting on dark Costa Rica beach CLOSE-UP

endangered olive ridley species sea turtle nesting migratory costa rica egg layers beach conservation wildlife sand perseverance vulnerable vertebrate testudine struggles ocean digging reptile tropical lepidochelys olivacea pacific turtle wild biology aquatic environmental hole marine shelled creature shore protected shell survival turtle nest zoology nighttime active nature sea animal brown close up no people sandy beach