The conservation measure targets a southern Illinois route linking LaRue Swamp with the 46-metre limestone bluffs of LaRue-Pine Hills. Extended beyond their original three-week timeframes based on biological research, the shutdowns run during spring feeding migrations and autumn returns to winter shelter. Past field studies revealed that nearly one in four snakes collected along the passage had been killed by vehicle traffic. Although motor vehicles are prohibited during these periods, pedestrian observers are permitted to walk the road.
Key points
Federal authorities lengthened the original 1972 closure periods after scientific researc…: Federal authorities lengthened the original 1972 closure periods after scientific research proved the migration windows lasted longer.
Vehicle restrictions eliminate traffic dangers for cold-blooded reptiles that move slowly…: Vehicle restrictions eliminate traffic dangers for cold-blooded reptiles that move slowly or freeze when cars approach.
Pedestrians may walk the route to watch the migration, but handling or collecting wildlif…: Pedestrians may walk the route to watch the migration, but handling or collecting wildlife is prohibited by law.
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A road in southern Illinois, United States, has an unusual reason for closing to traffic twice a year: thousands of snakes and other reptiles need to cross it during their seasonal migration. Known as Snake Road, the 4-kilometre stretch in Shawnee National Forest connects LaRue Swamp with the limestone cliffs of LaRue-Pine Hills. The animals travel towards the wetlands in spring to feed, mate and rest before returning to the cliffs in autumn for shelter. To protect them from passing vehicles, the US Forest Service closes the road during both migration periods, allowing visitors to explore it on foot.
Why do thousands of snakes migrate across Snake Road twice a year
Snake Road lies between two important ecosystems in the Shawnee National Forest. To its west is LaRue Swamp, which forms part of the Mississippi River basin. To the east are the LaRue-Pine Hills, an area known for its limestone cliffs, which rise 46 metres above the surrounding landscape.
The seasonal movement takes place as temperatures change. In spring, reptiles emerge from hibernation as the weather becomes warmer and travel…
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