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(looks like I’m over the Holidays, eh?)
So, on Christmas Island there are over 120 million crabs running a muck. They’re famous for their annual migration where they travel to the ocean to lay their eggs. During the migration, the crabs cover highways so densely that they are even visible from the air! Volunteers help to shovel the crabs off the roads so that the poor creatures don’t get accidentally run over. Unfortunately, some of the countless millions inevitably get hurt.
Here’s an interesting little tidbit of info too: Early inhabitants of Christmas Island don’t even mention the crabs. It’s possible that the enormous population stemmed from the extinction of endemic Maclear’s Rat, in 1903, which may have controlled the crab’s population
Great video: