"Perhaps there is some sort of spin-off from the aflotoxin problem which
is especially associated with raw peanuts."

I would tend to agree with this analysis. However, I would not limit the problem to raw peanuts. The problem could also occur with your peanut butter if it was made from affected peanuts. So, although I know of no reason for birds not to ingest peanuts, I would suggest tasting any peanut butter that you use to make sure it does not taste rancid.

Good birding,
Ron McCluskey
Cheney, WA

rmcclsky at mindspring dot com
http://canondigitalslrs.com