We're fairly sure that it's a he, going by the size of his caruncles and also the way he was hissing violently at the cat this morning.
But he seems better! We'll be taking him to the vets this week to get a qualified opinion on it, and also for a general check-up to see what his health is actually like etc, but he's definitely a different duck to the one we originally saw sitting in the cage.
He's so adorably needy, too! My partner claims that he's "definitely my duck" because he follows just me around the house, squeaking, as I move from room to room. I had to lie a towel on the floor next to the bed for him to sleep on yesterday afternoon when I tried to take a nap, because he couldn't see me and made quite the racket! Haha. I hope this clinginess will wear off a little once he meets our girls outside and starts to make friends with them though, as cute as it is...
Some of my friends on Facebook, after following this story and then finally discovering the name of the place, have commented and sent messages to the store regarding it - the store has deleted every single negative comment and now disabled commented entirely on their page. Professional, huh?