Science Friday

Slow Breaking News: A Giant Tortoise Revival

March 13, 2026

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  • Conservationists successfully reintroduced 158 young tortoises, genetically related to the presumed-extinct Floreana tortoise subspecies, onto Floreana Island in the Galapagos after a captive breeding program. 
  • The survival of the Floreana tortoise genetics is attributed to a combination of preserved DNA from remains found in caves and the discovery of close relatives on another island, possibly due to historical use of tortoises as ship ballast. 
  • The reintroduction event was highly emotional for the community, marking the return of a species unseen since the 1850s, and is part of a larger, 15-year restoration effort for Floriana Island that includes invasive species removal. 
  • The segment also briefly covered the start of sea turtle nesting season in Florida and the discovery of fossilized tracks suggesting an ancient sea turtle stampede in Italy 80 million years ago. 

Segments

Turtle vs. Tortoise Definition
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(00:00:03)
  • Key Takeaway: All tortoises are a subset of turtles, specifically those that are primarily land-dwelling.
  • Summary: The segment opened by defining the relationship between turtles and tortoises, noting that tortoises are land-dwelling turtles. Turtles, as a broader category, can include both aquatic and non-aquatic species. This clarification was prompted by the focus of the Science Friday episode, “Slow Breaking News: A Giant Tortoise Revival.”
Galapagos Tortoise Revival Science
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(00:01:33)
  • Key Takeaway: The Floreana tortoise subspecies was revived through captive breeding using genetically similar tortoises found on another island, matched against DNA preserved from ancient remains.
  • Summary: Conservationists released 158 young tortoises onto Floreana Island, a subspecies thought extinct since the 1850s. The breeding program utilized tortoises from another island whose genetics closely matched DNA recovered from ancient Floreana tortoise remains. These young tortoises, raised to 8-13 years old, are now being monitored on the island as part of a long-term restoration plan.
Tortoise Release Emotional Impact
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(00:06:12)
  • Key Takeaway: The release of the tortoises was a momentous and emotional event for the local community, realizing a story passed down by grandfathers.
  • Summary: Unlike dramatic animal releases, the tortoises immediately began exploring and eating upon release, showing no hesitation. The experience was deeply meaningful for the community, as it validated oral histories about the species’ past existence on the island. This success is part of a 15-year restoration effort that also required removing invasive species.
Sea Turtle Nesting Season Update
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(00:09:26)
  • Key Takeaway: Sea turtle nesting season is underway, with Delray Beach, Florida, reporting the first leatherback turtle nests, requiring the public to limit light pollution.
  • Summary: Sea turtle nesting season, which is temperature-dependent, has begun, marked by the first leatherback nests in Delray Beach, Florida. Citizens in nesting areas should avoid disturbing nests, which require about two months to hatch. Limiting light pollution is crucial as extra light can negatively affect the behavior of nesting turtles.
Ancient Sea Turtle Stampede Fossils
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(00:10:24)
  • Key Takeaway: Fossilized flipper tracks in an Italian limestone slab suggest hundreds of ancient sea turtles stampeded across the oozy ocean floor following an earthquake 80 million years ago.
  • Summary: Researchers studied hundreds of crescent-shaped flipper marks discovered on a mountainside slab in Italy. The evidence, including ripple marks and fossil plankton, suggests ancient sea turtles fled en masse due to an earthquake while on the ocean floor. The resulting mud was then covered by sediment, preserving the tracks for approximately 80 million years.