I've seen a few posts where people suggest a young chick is a roo based on the posture.
What does a roo posture look like when they are still too young to guess based on comb size or other physical features?
Not sure about posture but they sure do like to play fight more than pullets.
See my thread from a few minutes ago. The 3 I have in a group of 6 sure do play fight each other a lot. They are about 2 months old.