Genetic Analysis Reveals Origins of Extinct Seychelles Crocodiles
For over two centuries, the disappearance of the Seychelles' crocodile population remained a historical enigma. While early explorers documented these reptiles as a common sight upon their arrival in the 18th century, the animals were hunted to extinction within just 50 years of permanent human settlement. For years, scientists debated whether these creatures represented a unique, endemic species or a localized group of a known variety.
Recent genetic research conducted by scientists from the Bavarian State Collections of Natural History and the University of Potsdam has finally settled the debate. By analyzing mitochondrial DNA extracted from preserved museum specimens, researchers confirmed that the Seychelles crocodiles were not a distinct species. Instead, they were an isolated population of the saltwater crocodile (*Crocodylus porosus*), the world's largest living reptile. The findings indicate that these animals likely traversed at least 3,000 kilometers of open ocean, utilizing favorable currents to reach the remote archipelago.
This discovery highlights the remarkable biological resilience and mobility of the saltwater crocodile. Equipped with specialized salt glands that allow them to process seawater, these reptiles are uniquely adapted for long-distance maritime travel. The study confirms that before their local extermination, the species maintained a massive geographic range spanning over 12,000 kilometers, stretching from the Pacific islands to the Indian Ocean.
Beyond solving a long-standing biological mystery, this research underscores the importance of museum collections in modern evolutionary studies. By applying advanced genomic sequencing to historical samples, scientists can reconstruct the lost history of species and better understand how wildlife populations historically navigated and colonized isolated ecosystems. This insight into the species' past mobility provides a clearer picture of how saltwater crocodiles successfully established one of the most expansive ranges of any reptile on Earth.