Thousands Of Crabs Crowd Waters Off Australia

MELBOURNE, Australia -- Tens of thousands of spider crabs have filled the waters off the coast of Australia.

More than 50,000 of the crustaceans have swarmed onto a sandbar near Melbourne.

The crabs have formed a 3-foot-thick cover the size of a football field on the ocean floor.

Scientists said the phenomenon is extremely rare. They aren't sure why so many of the spider crabs have converged on the same area.

Normally, the crabs are found spread out on the ocean floor.
(via)