Okay, so when I first bought my 3 chickens, they were only a week old (born on may 1st). 2 were for sure to be female and then there was a 3rd "mystery" chicken. They weren't sure what kind of chick it was in terms of breed, nor did they know the gender. I got it at a pet shop that mainly sold fish-related things, with a few hamsters and reptiles here and there. Chicks were seasonal, blah blah blah. Long story short, fast forward 3 months and now I have this unknown chicken still. It's the same age as the other chickens but it is noticeably much more slender and it does this half-arsed crowing sound, as if it's choking on something. So now I'm thinking, okay, maybe it's a roo... but aside from the slightly more slender feature, its other physical characteristics point towards female for me. I've done a little research and I THINK it's a Sicilian Buttercup. The pet store did tell me it's a "rarer" breed of chicken, they just aren't sure which one. And the coloration does resemble a Sicilian buttercup hen, but why the C-C-C-R-A-A-W-W-W-K-K-K sound of crowing? I've listened to hens that do their egg call and it certainly doesn't sound like that. Doesn't sound like a full rooster crow either, they're only 3 months after all. And if it is a Sicilian, it hasn't shown its beautiful comb it's known for (yet). I see bumps possibly forming though, but it could go either way, as you can see in the pic. As in, the bumps may just be small bumps rather than a comb forming. How old do Sicilians get a fully grown out comb? If it isn't a Sicilian, then what is it? Also, gender? I don't know how to vent sex, I've tried it. They all look the same to me... Here's an image of them when they were young. The one to the far right is the "mystery chick" Jump 3 months and here's what s/he looks like now. Forgive the dark setting, bad angle and getting a shot of the chicken was difficult since they don't like being held.