Migrating birds are now believed to be responsible for the spread of a deadly strain of avian flu that has been wreaking havoc across the globe. Scientists have discovered that the virus is able to survive on the feathers and droppings of migrating birds, and can be spread from one continent to another. This means that the virus is able to travel long distances, and infect entire populations of birds in a very short time. In addition, the virus may be able to survive for months in the environment, and become even more dangerous.

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source: Phys.org