By Wil Longbottom
Last updated at 3:45 PM on 7th January 2011
Blue stain believed to be sign of poisoning or hypoxia - lack of oxygen that is precursor to altitude sickness
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At least nine incidents of mass animal deaths across the globe
Hundreds of confused birds plummeted to their deaths in multiple locations in the U.S.
Rapid movement of Magnetic North Pole towards Russia may have caused bird deaths
Thousands of dead turtle doves rained down on roofs and cars in an Italian town in the latest in a growing spate of mass animal deaths across the globe.
Residents in Faenza described the birds falling to the ground like 'little Christmas balls' with strange blue stains on their beaks.
Initial tests on up to 8,000 of the doves indicated that the blue stain could have been caused by poisoning or hypoxia.
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