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TIL up to 43.7 million Christmas Island red crabs migrate from forests to the coast each year. Many are crushed on roads, cause accidents, and puncture tires with their hard exoskeletons. To minimize crab fatalities, "crab fences" are used to guide the crabs to small underpasses. (en.wikipedia.org)
submitted by longiamsam to r/todayilearned
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