We recently acquired some new pullets for our flock, 6 of them being Welsummers. We didn't realize how similar they looked to some of our Whiting True Blues and now that we have them all mixed together it's hard to tell them apart. Does anyone have a sure way to differentiate them? We're unsure if we're keeping the Welsummers but we don't want to accidentally give away our Whitings so it would be good to be able to tell them apart!