Director's Choice
Joel Sartore
National Geographic Magazine
"GREAT MIGRATIONS"
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More than a million animals a day are killed on U.S. roads, including this one. Here, a western cottonmouth snake lies dead on the Clear Creek Levy Rd, near Ware, Illinois. Road kills are one of the leading causes of death for snakes in the U.S., Studies are showing that snakes with the genetic tendency to migrate are being killed in ever-increasing numbers on our nation's roads, leaving those snakes with non-migrating tendencies behind to breed.
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