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A B.C. wildlife veterinarian says it's not clear what paralyzed and killed dozens of crows.

After an examination of eight dead juvenile crows, a provincial wildlife veterinarian is baffled about what paralyzed and eventually killed dozens of crows. 

In July, Helen Schwantje received reports of paralyzed crows in B.C’s Peace Region.

The reports, which sparked a flurry of public speculation that industry was to blame, prompted wildlife officials to conduct an examination.

"We were very curious about this, so we actually went all the way and had each bird radiographed, and some of them had cat scans as well."

Schwantje says none of the young birds had an infectious virus, such as West Nile, and she says there is no evidence industry played a role.

"I think the public needs to understand that growing birds like this, their bones are not fully mineralized and they're very fragile,” she said.

But there are a few theories, Schwantje says.

One possibility is that the birds suffered some kind of trauma which caused the fractures, but she admits she does not know what the cause was,

Another theory, which Schwantje says is the most rational and logical, is extreme wind may have blown the young birds out of their nests earlier than they normally would have left the nests.

Even though the mystery has not been solved, the provincial investigation is complete. 

With files from the CBC's Marissa Harvey