Roos or pullets?

[crazychickenmamamia]

Hello was just curious what everyone’s opinion was on my chicks. They are 4 weeks old so I know it is still pretty early to tell if they are roos but they are very aggressive towards each other. We think we might have three roos. Two of them are Rhode Island Reds and the other one is an Americana. Would love to know what you guys think. Thank you!

 

[nuthatched]

Second one may be a cockerel but it's too early

 

[pandabunny26]

Pretty early to tell, but looking at them I'd guess the second one is a roo because of the comb size. Also even pullets chicks will have little standoffs sometimes so that doesn't mean anything

 

[imacowgirl2]

My guess is second one is cockerel — there was some reading I found on here at one point that led to some research articles that showed the same thing — for the faster maturing breeds, the cockerels will show a comb that protrudes instead of being parallel in a straight line to the head plane around 3 weeks old. I’m testing it on my current batches of australorp and leghorns, but it was spot on for me last year, even before I knew it was a thing.