Definitely you can. I have 20 birds living together peacefully that are 8 different breeds. There are 8 of one type, 4 pairs and the rest are singles. In the garage where all my meaties and babies are, there are 5 different pure breeds, and 6 mix breeds. I honestly have no idea how many are in there right now since we've slaughtered some of the meaties. The bigger issue with a mixed flock is mixing ages. If the older ones are old enough they'll pick on the littler ones, possibly killing them.