Hello, All! Long time lurker but first time poster here. My small flock consists of 12 columbian wyandottes that I had purchased from a craigslist ad (I know...you take your chances there). They are approx 8 months of age, but ive just recently notices some greenish-blue tint to their tailfeathers. Is it likely that they are a cross, or is this something I just didnt know about the breed? Thank you in advance!