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This is what a male would look like if you had one (mostly white in color): These are sex link pullets: So no worry about having too many males, as you have none. Pics from about halfway down this page: http://www.feathersite.com/Poultry/CGP/Sex-links/BRKSexLink.html

As stated, the pictures you posted are of sex link pullets. Edit: I realized you are probably referring to other birds you have as RIR, not these birds. These ones are all pullets.