There is such thing as intersex chickens. It is 100% possible@southernbound13, Cold Hard Fact: if it lays an egg, it's a hen. It truly does appear to be a rooster, though, and if so, then it did not lay the egg. And...chickens--just like people can't, whether they pretend or try to or not--cannot change sex. Gyandromorphs? That's nonsense. Not all or most hens lay the exact same shade of egg...that egg had to have been one of your hens. All I know is, that red chicken is not a unisex...because there's no such thing as that. It's either a male, or a female.
~Ruby