ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   w   w   w dot w a t e r f o w l dot o r g dot u   k   s l a s h   l i d u c k s dot h t m l b i r k b e c k	http://www.waterfowl.org.uk/liducks.htmlbirkbeck	1