Picture of Stori Smith

Stori Smith

Senior Staff Writer for SAFE Worldwide

Sea Turtle Nesting Site:

A Turtle Tradition

Kemp’s ridley (Lepidochelys kempii) sea turtle hatchlings scuttle across the sand. Photo: NPS

As they scuttle across the sand toward the ocean, newborn sea turtles are already creating decades-deep memories. They imprint on the chemical specifics of the sand, coast, and ocean. These become a coordinate system of directional cues that, ten to fifteen years later, guide mature females back to their birthplace. Just as the tide predictably rolls on and off the shore, the females return year after year to the same beach. In this way, sea turtle nesting site is based on where the mother was born. 

Why Return to the Same Beach? 

Researchers think sea turtles do this to ensure they lay their eggs somewhere safe. A nesting site needs specific sand type, temperature, accessibility, and low predator presence. Sea turtles seem to trust the beach their mothers chose for them. How exactly, after ten to fifteen years and across 1000 miles, do they find the spot they were born? The answer is still unclear. 

One idea is sea turtles have magnetic particles in their brains. These particles may detect and respond to planetary angles of inclination and declination. By picking up on their birthplace’s unique magnetic features, they seem to create their own compass that points back to their very first beach. This magnetic imprinting is repeated generation after generation, making sea turtle nesting site a tradition of sorts. Shifts in Earth’s magnet field occasionally cause sea turtles to miss their target. But, overall, the animals have remarkable accuracy across their entire reproductive decades. 

Using Nesting Site Selection to Save a Species

Conservationists have even enlisted sea turtles’ internal compasses to help species recover. The Kemp’s ridley sea turtle’s nest numbers in Tamaulipas, Mexico, reached unsustainable lows due to human interference. Conservationists responded by moving eggs from Mexico to Padre Island, Texas, between 1978 and 1988. They hoped this would provide a new nesting site for the critically endangered species. In 1996, one of the relocated females returned to Padre Island to lay her eggs. Since then, Kemp’s ridley sea turtles have continued to return to the Texas nesting site. Twenty-five years after the relocation project, Kemp’s ridley worldwide nest counts increased from 702 to 20,000

Since then, oil spills and pollution have taken a toll on the species. But if we continue to conserve the Kemp’s ridley—and all other sea turtles—hopefully, far beyond our own lifetimes, sea turtle hatchlings will crawl across the same stretch of shoreline we see their ancestors traveling today. 

 

Watch our Wild and Wonderful Wildlife video to learn more about threats to sea turtles and how to help. 

 

 

Sources

Emslie, Karen. “How do sea turtles find their way home?” Discover Wildlife, https://www.discoverwildlife.com/animal-facts/reptiles/how-do-sea-turtles-find-their-way-home/

“How Baby Sea Turtles Find Their Way Home.” WETA, https://weta.org/watch/shows/its-okay-be-smart/how-baby-sea-turtles-find-their-way-home

“The Story of the Kemp’s Ridley.” National Park Service, 10 Oct. 2020, https://www.nps.gov/pais/learn/nature/kempsridleystory.htm

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Start a Community Garden

A community garden is a wonderful way to bring people together while growing fresh, healthy food. Kids can ask their school, local library, or community center if there’s space to start a garden, then invite neighbors and classmates to help plant, water, and harvest vegetables or flowers. Some gardens even donate their extra produce to food banks or share it with neighbors who need it. It’s a hands-on way to learn about nature, teamwork, and taking care of your community’s shared spaces.

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Raise Funds for Local Wildlife Center

Wildlife centers take care of injured or orphaned animals, and they always need extra support to keep helping. Kids can host a bake sale, lemonade stand, or online fundraiser, or organize a “walk-a-thon” with friends and family to raise money for a wildlife rescue near them. You could also collect donated supplies the center needs, like towels, blankets, or pet food. Even a small donation can help feed, shelter, or heal an animal in need.

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Recycling Project

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Booth at Local Farmers Markets

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Beach Clean-Ups

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Tree Planting Events

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