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First, the blackbirds fell out of the sky on New Year's Eve in Arkansas. In recent days, wildlife have mysteriously died in big numbers: 2 million fish in the Chesapeake Bay, 150 tons of red tilapia in Vietnam, 40,000 crabs in Britain and other places across the world. Blogs connected the deadly dots, joking about the "aflockalypse" while others saw real signs of something sinister, either biblical or environmental. The reality, say biologists, is that these mass die-offs happen all the time and usually are unrelated. Federal records show they happen on average every other day somewhere in North America. Usually, we don't notice them and don't try to link them to each other. "They generally fly under the radar," said ornithologist John Wiens, chief scientist at the California research institution PRBO Conservation Science. Since the 1970s, the U.S. Geological Survey's National Wildlife Health Center in Wisconsin has tracked mass deaths among birds, fish and other critters, said wildlife disease specialist LeAnn White. At times the sky and the streams just turn deadly. Sometimes it's disease, sometimes pollution. Other times it's just a mystery. [ MYWAY NEWS ] 'This is a classic example of freak events coinciding'
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