stairing each other down

[JFL1950]

we had three hatch a week ago now two the 1st born and the second are always stairing each other down with there butts up and running into each other the third one watches.
are they males and the other one a female or what?

 

[BeckyLa]

It's games they play as they learn to establish pecking order. At this age I can't tell if they're male or female as both will exhibit this behavior.