I have a 5 year old call duck, Maddy, she's always been a bit twitchy and nervous looking (I bought her last year). There are certain 'things' she has always done such as twitch her wings and her tail. She has started falling backwards onto her back, however she can flip herself back over quickly. She's isn't lethargic or weak, in fact she's pretty strong (still tries to bite me!). She can't preen herself so she looks a bit scatty! I've taken her away from the other two ducks (who are completely fine) just in case it is something contagious. Any ideas? I'll try and get some videos of her so you guys can see what I mean!