mrsD's signature raises the problems that birds are facing. Ironically these problems may be due to a thiamine deficiency. Balk et al. write [1]:

"Wild birds of several species are dying in large numbers from an idiopathic paralytic disease in the Baltic Sea area. Here, we demonstrate strong relationships between this disease, breeding failure, and thiamine (vitamin B1) deficiency in eggs, pulli, and full-grown individuals. Thiamine is essential for vertebrates, and its diphosphorylated form functions as a cofactor for several life sustaining enzymes, whereas the triphosphorylated form is necessary for the functioning of neuronal membranes. Paralyzed individuals were remedied by thiamine treatment."

Over the years a number of posts to this forum have been made suggesting that birds may play a part in the aetiology of Parkinson's.

Reference:

[1] "Wild birds of declining European species are dying from a thiamine deficiency syndrome"
Lennart Balk, Per-Åke Hägerrotha, Gun Åkermana, Marsha Hansona, Ulla Tjärnlunda, Tomas Hanssona, Gunnar Thor Hallgrimssonb, Yngve Zebühra, Dag Bromana, Torsten Mörnerd, and Henrik Sundberga
12001–12006, doi: 10.1073/pnas.0902903106
http://www.pnas.org/content/106/29/12001.full

[2] "Do birds play a part in Parkinson's"
http://neurotalk.psychcentral.com/thread184736.html

John