Black Australorp sexing hints..

[DanielStokes]

I got five BA chicks at TS. They are about a month old now and I was wondering if there were any hints on sexing them at this age. There are some distinct differences already. Some of their tails seem to stick straight up while the others point outwards. Some of them have more pronounced combs than the others.
These are my first chickens and I am just wanting to know what to name them. Trying to avoid chicken gender confusion.
Would pictures help?

 

[wackyChris16]

Yes, pictures would help most definitely.

At four weeks I would be looking for aggressive behavior in roos, redder combs, and an overall "rooish" feel if you picked it up and felt it's weight and structure underneath the feathers.

 

[DanielStokes]

These pictures are about a week old. I can get new ones in the morning. One of them was showing a little aggressiveness for a few days, but now it seems to have stopped.

 

[ramirezframing]

all the ones in the pics are boys, the bigger redder combs give it away

 

[wackyChris16]

They all look like cocks, sorry.

 

[OldChurchEggery1]

I'll have to agree that they look quite masculine. Were they sold straight run?