Is the white one getting its wing feathers 2x as fast as the other chicks, because my leghorns sure for wings before everyone else in the brooder, and I don't know what the reddish ones are, but I don't think they are red sex links. I could be totally wrong.
Hmm after seeing that link I'm going to wager that your orange chicks are rir. And that perhaps an Australorp is your black one...but it looks like your has fewer spots, could just be a slight difference but same breed though.
Thanks you guys! I'm scared now that all my hens are going to be mean! After reading about "production reds". I sure hope not!! Today I'll post a pic of the one with the white on wings! And I'll post these girls again in a week or two!