My previous post resulted in many comments and also in identification of the creature who killed the duck.
Consensus is that it is a mink. Thank you for to everyone who took the time to send links to websites and those of you who shared your own knowledge and that of your friends.

I’ve been identifies! I’m a mink.
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About janewalkerscards
Jane Walker is a Newcastle photographer who creates framed photographs, photo trays and matted greeting cards reflecting the beauty of nature and gardens. Her recent interest in birds, owls and other wildlife is now being reflected in her posts. As a member of the Oshawa Camera Club, Jane has started to enter some of her photos for judging and appreciates the critiques by the judges. You'll be surprised at what shows up under the guise of "janewalkerscards".
nasty mink
That’s what I thought at first. I guess evryone and everything needs to eat!
Of course, why didnčt we think of that. Judy
Date: Thu, 13 Feb 2014 16:07:40 +0000 To: judy.metcalf@hotmail.ca
Hi Jane:
Glad to see the animal was identified. I have thoroughly enjoyed your posts this winter. Lovely pictures!!
I’m sure, like everyone else you are looking forward to Spring.
Happy Valentines Day.
Carole
Date: Thu, 13 Feb 2014 16:07:42 +0000 To: cireneelliott@live.ca
Carole,I’m glad you enjoyed these wintery “posts” and yes, I can’t wait for spring. There is such beauty in winter but I am tired of it!