I have three possible roos - a brown leghorn (sold as a pullet), an australorp (straight run from TSC) and a bantam silkie (ditto). All approximately 6 or 7 weeks old. What do you think? I know female leghorns have large combs, so hoping she's a girl. The Australorp is very aggressive - chestbumps and herds the others. S/he particular picks on the silkie