hi there.... ty for your in depth reply, i will try what you suggest... have never experienced this before, the birds were brought in from sales at the blackpool show this yr so not sure what husbandry they had before i purchased them.
They have access to an aviary although they havent used this at present due to being paired up. the aviary is always locked at dusk judt to make sure no rats or vermin can get access, also staymore poison is used in bait boxes all around the lofts and is used at all times .
again may thanks .. kev