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Now Sweden is the latest country to report mysterious deaths of a large number of birds.

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Now dozens of jackdaws like the one seen here were found dead on Tuesday and Wednesday.

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Now Swedish veterinarians autopsied five of the birds and say that there were no signs of infection or disease.

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They say the birds instead appear to have died from, quote, "sudden hard external blows."

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Now Sweden's eerie report echoes other recent and unexplained mass bird death incidents.

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Over the last week, flocks of dead birds have been found in two U.S. towns in Arkansas and in Louisiana.

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Now Martin Savidge talked with some of the experts investigating those mysteries.

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These three red-winged blackbirds from Arkansas could hold the key to a disturbing puzzle.

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Working with the birds inside what's called a bio-safety cabinet, Dr. Kevin Keel begins to try to determine what killed them.

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And not just these birds, but thousands of others New Year's Eve.

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The cabinet is a precaution just in case the birds were the victims of some disease.

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Scientists don't think so, but let's let the doctor explain as he begins the exam.

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And I'm looking and palpating for any broken bones, and feeling the bones in the wing,

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trying to tell if there are any fractures. I'm looking for hemorrhages.

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Sometimes if birds fly into things, you may see hemorrhages in the mouth.

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You may see fractures of the beak.

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All the evidence we have so far suggests that this was a traumatic event.

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Traumatic event, as in the birds ran into something -- something hard.

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The lab has already dissected and x-rayed the Louisiana birds,

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and the internal damage suggests the birds likely died as a result of a collision.

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This tells us that these birds probably flew into inanimate objects which caused the trauma.

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We looked for evidence of gunshot injuries with the radiographs and didn't see any.

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And so they may have flown into anything from buildings or power lines or towers,

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or it [they] could have flown into the ground, as well.

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Power lines are thought to be to blame in Louisiana.

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In Arkansas, it was noted the bird deaths occurred near where they roost for the night.

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Simply put, something startled them, possibly fireworks since it was New Year's Eve,

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and the birds took off panicked into the darkness.

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The weather in that area last night, the night of the mortality event, was overcast.

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There was a little bit of rain so there was a low ceiling.

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It wasn't foggy, but it still may have resulted in some disorientation of the birds and contributed to them flying into objects.

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Even though authorities believe it is blunt-force trauma that's to blame,

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they will take tissue samples and send them out for further testing

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just to make sure we're not talking about some sort of disease, a chemical or possibly even poisoning.