Sea turtle species, even when sharing nesting beaches, exhibit distinct at‐sea movements and foraging behavior. At Playa Cabuyal, a sea turtle nesting beach in northwest Costa Rica, we utilized satellite telemetry to reveal the post‐nesting movement of green turtles ( Chelonia mydas , n = 9) alongside carbon and nitrogen stable isotope analysis of skin samples of green ( n = 28), olive ridley ( Lepidochelys olivacea , n = 20),...