I think that refers to a mould contaminant that would affect humans. I have seen 'not for human consumption' on most peanuts that are sold as bird food. No doubt you will receive a more informed reply in due course.
Unicum arbustum haud alit duos erithacos
(One bush does not shelter two Robins)
Zenodotus (3rd Century B.C.)
Here is an English website AG with info on aflatoxin ...
www.foodsafetywatch.org/.../aflatoxins
& enough other technical problems affecting our food to cause some sleepless nights!!
Another here .. http://www.birdchannel.com/are-peanuts-bad-for-birds.aspx
I gather that the answer is to buy small quantities of high quality peanuts so that they get used up quickly ... it costs more but they can be used as a treat rather than staple food & the peace of mind is priceless!
2013 photos & vids here
eff37 on Flickr
That was an interesting read Wendy, I only buy smll quantities as had noticed the difference between certain brands and shops, they sometimes seem to be stale, but didn't know about contaminants.
Lot to learn
I did know there was a problem with the bird peanuts as they are not scrutinised as much as human consumption ones I believe! I only buy what I can see & then get them out of polybag asap & into airtight container! Only have one small mesh feeder which I can check daily & never leave out overnight, keeping them dry certainly helps!
The best way I have found to offer them to the birds is to chop them whilst fresh & combine with the home made pastry ... they all love that & the nuts are gone in a day!
Thank you, I have found out that aflatoxin levels should not exceed 20 parts per billion for bird nuts and 2 parts per billion for human consumption but will buy smaller quantities as suggested.