Thank you so much for your kind replies. The Khaki Campbells are domesticated ducks which have originated from Mallards and I admit the male looks very similar (especially with his spring feathers and lovely green head, which changes to a dark brown colour after breeding season) as does the female but the KK female is brown all over and mallard females have beautiful green / blue feathers at the end of each wing. I must apply again and try to show you Donald my beloved old female Mallard (yes I know she had a male name) but she truly was a very funny duck.