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Bridges, Overpasses and Underpasses for Crabs
Christmas Island's unusual infrastructure
By Rain Noe - March 9, 2020
Putting "shoes" on your Toyota Land Cruiser is an unusual mod for a 4x4. Photographer Chris Bray did it (we showed it here) to prevent crushing crabs as he and his wife traverse Christmas Island, where some 40 to 50 million of the little red crustaceans conduct an annual mass migration.
Since not everyone is crafty enough to DIY such things, Christmas Island authorities have funded crab-centered infrastructure, like these overpasses:
Image credit: Kirsty Faulkner
Workers place crab-deterring barriers along the sides of certain roads, to steer crabs towards the overpasses and/or the underpasses they've created:
You might think maintaining infrastructure for crabs is easier than for humans--at a minimum, there's no graffiti to remove--but Parks Australia, which is responsible for the maintenance, writes that it still presents challenges:
"Five km of temporary fences has been added to the 12 km of permanent fencing that funnels the crabs along the sides of roads and into the underground crossings and a year's worth of leaves and debris has been raked out of the tunnels so the crabs can get through – it's a mammoth job that needs to be done quickly."
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Rain Noe
I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.
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Bridges, Overpasses and Underpasses for Crabs
I think this is well worth the effort and very well done. I imagine the underpass must be less expensive than the overpass.. But then there is road maintenance to consider...