Is she a roo?

I bought pullets, but I know how unreliable the sexing can be. I have absolutely no idea how to tell the difference at such a young age, and I am very new to chickens, but she looks different than all of the others, and acts differently. She's much bigger than the others, but has developed at the same rate, if that makes sense. All of the same feathers came in at the same time as the others. She's the same age, but her comb is much bigger as well. She's also lead hen, but that doesn't surprise me considering her size. She is much more dominant of the others. Is she just bigger? Or could be be a roo?

Here she is:


One her age:


Another her age:


Next to one her age:


Also, I'm new here. And very excited to be a part of this forum! Thanks for any looks and replies.

I also wanted to add her wattles are already developing, and are much larger than the others. You can kind of see them in the picture. I can upload a larger one if you guys need me to.

Wanted to also add that I just went out and looked, her comb is pink, her wattle is red, the others have little yellow nubs for wattles and their combs are yellow. If that helps?

Her feet also look much larger, but that could just be she's so much bigger in general.

If you bought them online, it is very likely she's a he. Most hatcheries throw in a few extra as a form of insurance. If you bought 25 birds, they will usually throw in 3-4 extras, in case a couple don't survive the trip. That saves them thousands of dollars adjusting the price for "no shows", and dealing with unhappy customers.

Since the majority of buyers want only pullets, the hatcheries end up with thousands of cockerels that they must exterminate. That is one reason some hatcheries sell "Fry Pan Specials" of 100 mixed breed male meat birds for as low as $29. What they can't sell, or give as 'extras' must go to the incinerator.

Therefore, the "extras" are likely to be males. (Almost) everybody's happy...especially the cockerels.

You will know for sure when 'she' starts to crow!

Almost 100% certain she's a he.