There is something called circling disease "Listeriosis" = birds walk in circles with twisted neck.
You could try googling that
Here is one link. My computer cant open it up but here is the link
http://www.cfsph.iastate.edu/Factsheets/pdfs/listeriosis.pdf
You could try googling that
Here is one link. My computer cant open it up but here is the link
http://www.cfsph.iastate.edu/Factsheets/pdfs/listeriosis.pdf
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