I read a topic in the RP years ago by a Canadian vet,who basically said the toxins in brown skin feeds such as maples and beans needs to be removed from the birds system,he suggested using pick blocks regular because of their Kaolin content ? To be honest I wouldn't be without them and before you ask,lately I fly bloody rubbish,but that's me not the birds. :emoticon-0138-thinking: :emoticon-0138-thinking: