Do I have a hens or roosters?

[tnorm]

My chickens are about eight weeks old and I can't tell whether some of them are hens or roosters. Any help would be appreciated, thanks! Here are some pictures


Ameraucana



Ameraucana



Rhode Island Red


Ameraucana


Was told this was a hen but just want to check thanks!

 

[sourland]

The first and last pictures are pullets - all of the others are cockerels.

 

[Whittni]

x2^