Crabs are invading Cuba -- and it's not the first time.
New video shows the annual migration of millions of red, yellow and black landcrabs making their way from forests on Cuba's southern coast to the sea.
As NBC reports, the crabs emerge at dawn and dusk, covering roads and climbing up house walls.
The crabs are not endemic to Cuba, and they're not the only ones that migrate from the forest to the sea in the country.
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