Was at Tomato Lake West Aust. the other day and saw the strangest thing, at first I thought it was just poo attached to the rear of a Blue-billed Duck ( male) but it didn't seem to dissappear in a cloudly puff like most poos duck do in the water. It stayed attached to the rear of him untill he managed to peck most of it off and finally he had to yank the last bit ( as you can see in the last photo). Would it be a worm ? Can't seem to find much info on the net .
could it not be his ? doodle.
as a kid we had a Mascovy male that used to flaunt it .
Kerry - Perth, Western Australia.
Kerry - Perth, Western Australia.
Lol, a detachable disposable curly doodle, giggle. Ahem, sorry I'll compose myself back into an adult
It kinda does look like it could be some sort of parasite, doesn't it? Or perhaps even some unidentified food/rubbish he ate, and shouldn't have, which has passed through him relatively undigested? We had a JR Terrier once who jumped up & grabbed the remainder of a rolled lamb roast, which still had part of the string around it. He started to pass the string the next day and, um, needed a bit of help in the end (not by me thankfully - I have a strong stomach for most things, but... 
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Edited to add: Meant to say, beautiful shots by the way
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West Coast Tasmania
All creatures are susceptible to parasites, such as worms. Round worms and Tape worms appear to be the most common.
If you type "do birds get worms" into google, a host of sites will pop up, most relating to domestic pets, but the principles are the same.
The worm, if that is what it is, is pretty large, but i guess almost anything is possible. Worms in domestic birds are treatable, but I guess wild birds are a different matter.
Dale Huonville, Tasmania
Yep my mum has to worm her pet ducks for this reason. That duck looks like it has a nasty tapeworm there, I hope he got most of it as they can break off in segments