Three years ago, scientists predicted that giant red crabs (King Crabs) would invade the Antarctic within a hundred years. Their prediction was too conservative; the crabs are already in there:
Giant red crabs invade the Antarctic abyss - environment - 07 September 2011 - New Scientist: They are laying waste to the landscape. Video footage taken by the submersible shows how the crabs prod, probe, gash and puncture delicate sediments with the tips of their long legs. "This is likely to alter sediment processes, such as the rate at which organic matter is buried, which will affect the diversity of animal communities living in the sediments," says Craig Smith of the University of Hawaii at Manoa, whose team discovered the scarlet invaders.