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Week in Animal Photos: Curious Bugs, Bomb-Sniffing Rats and More

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Christmas Island Crabs

The annual migration of these crabs requires them to walk for days, even though they move for less than 10 minutes a day the rest of the year -- and a new study shows just where these crustaceans get the energy to swarm the roads, golf courses, and beaches of Australia's Christmas Island.

Photo via National Geographic

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