My chicks are 2 weeks old today. I have equal numbers (5 pullets each) of BR, WR, SLW, RIR and black sex links (plus 2 RIR cockerels). Got them from Ridgeway Hatchery. The BR are by far the friendliest and most curious. The sex links are the least friendly/most scared of me. Also, they dont seem to be growing quite as fast as the others. The others all act about the same. Nothing earth shattering here. Just wanted to share my observations thus far, FWIW.