Cock fighting behavior in chicks?

[csummer8882]

LOL I just posted something like this the other day and was rest assured that mine were girls. Just establishing the pecking order. Today, they played outside for a bit. Every time any would go near this 1 girl (they are 7 weeks old) she raised he neck fur and chest bumped. Pretty funny to see, if you ask me!

 

[Pecknscratch]

Oh sure now someone posts this (why didn't I do it?

) and after reading thus far I hope I didn't give away any hens

I was pretty confident they were roos though because they had started crowing.