I was perplexed by the size diff between my keets. Later I realized that Harris Farms (TSC) specifically says french (jumbo) OR fancy. What they sent was a mix. I don't notice that big of a wt diff but LOOKING at them I see it. As for mating, my lavender had paired up with one jumbo, but she refused to leave her nest one night so that was the end of her and the eggs. He stayed with her during the day, but at night time, he headed in.