Looks like we got a rooster

Last night we heard the goofiest noise come out of one of our Ameraucanas... yes, I think it was a crow of a rooster.  We still aren't sure... it tried the noise about 5 or 6 times last night and we haven't heard it again today.  But these Ameraucanas were supposed to be all female... with a 95% accuracy rate.  Looks like we are part of the 5%/