For many years I've observed a rule which says 'never give white bread to ducks' as it is harmful for their livers, and causes a fertility imbalance so that many more male offspring are produced.
Round here (Manchester, N.England) there does indeed seem to be a huge imbalance in the sexes of mallards, in some areas I would say around ten males for every female. This causes a great problem for the females who are constantly being pestered by the unwanted attention of all these males, who also fight over her among themselves.
I also observe most ducks in public spaces (eg ponds in parks) being fed white bread by the public.
But is there really a connection: white bread causes liver disease and breeding imbalance? Or is there another reason why there are so many more males to females? Any experts on this out there?
Alan Hill
Round here (Manchester, N.England) there does indeed seem to be a huge imbalance in the sexes of mallards, in some areas I would say around ten males for every female. This causes a great problem for the females who are constantly being pestered by the unwanted attention of all these males, who also fight over her among themselves.
I also observe most ducks in public spaces (eg ponds in parks) being fed white bread by the public.
But is there really a connection: white bread causes liver disease and breeding imbalance? Or is there another reason why there are so many more males to females? Any experts on this out there?
Alan Hill