My ducks

I had ducks- Sheldy and Noodle- we kept them in our garden with our chickens and they got really dirty and fat and lazy so we put them on the river. They are now very thin, hungry, have no home, but they're clean and active and like the water We go to feed them every couple of days. They used to sleep in an abandoned moorhen nest but a goose pair has taken over that and have laid eggs. I hope my ducks can breed too- Sheldy's a girl and Noodle's a boy.
I was just wondering what breed my ducks could be. I know lots of stuff about chickens but not ducks. Mine are white- plain white, nothing else. Sheldy's beak is this intense yellow coulour (it's not too bright though), Noodle's beak is more pinkish and dull. They're a bit bigger than your average hen (well my chickens anyway). Sheldy squawks loudly and Noodle makes this rasping noise like he's trying to squawk but there's something in his throat. That's how I tell the gender- I read somewhere female ducks have a loud quack and drake ducks have a quiet quork.

 

The ducks are happy on the river- they chase away moorhens and little ducks but they're scared of geese. They've even establishedtheir own "home" area.