Chicks gender?

[chickypen27]

Not sure how to post a new thread as I am a new member. But I have a question about gender for a supposed Ameraucana chick I have. It may be too soon to tell, but she/he is about the same age as the rest of my chicks. I got her from a different place than the rest of my chicks. The tail is much shorter and she seems kind of aggressive towards the rest of my chicks.

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For some reason not all of my pics posted...

 

[bcjlemaire]

How do you know the top 2 or 3 are males? Is it the crown on the top of the head? Because I thought females have those also?

 

[centralcaligirl]

Hopefully I added the picture correctly. My 4 week old BO chick. Pullet hopefully???