Giant Jellyfish seem to be in abundance in the oceans, Scientist believe it is due to over fishing.
The jellyfish can become as big as a sumo wrestler and can kill a person. Fish normally eat the baby jellyfish and compete with them for the plankton, but since there has been so much over fishing the jellyfish are able to multiply and increase in huge numbers.
link to article: http://www.abc.net.au/news/stories/2009/06/08/2592196.htm
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