I am assuming she is a hen. She is around 16 weeks old. She has always been slightly bigger and lighter colored... but the color difference isn't hugely noticeable... she's more grey. She has always had a slightly bigger comb but now it is huge and red and so are her wattles, while my other two of the same age are much different looking. I'm assuming she is just getting ready to start laying, but her behavior has become much more aggressive lately too. She has started biting (though she is not mean in any other way) and she chases off birds and squirrels in the yard. Myabe just a strong personality?! Let me know what you think!