Abstract
Within minutes after emerging from underground nests, sea turtle hatchlings Caretta caretta L. locate and crawl to the ocean, enter the surf, then maintain oriented courses that lead them out to sea even after they no longer detect land. The cues hatchlings use, while the subject of some speculation, were unknown. Recent field studies show that hatchlings orient toward surface waves. Our experiments, conducted in a wave tank, demonstrate that loggerhead sea turtle hatchlings maintain headings toward oncoming waves. The response does not depend upon visual cues as it persists in the absence of visible light.
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