I bought 16 BCM hatching eggs from a guy our Kansas who said his BCM were from the B. Davis line. None of them have any kind of bump. I did however have one from the first hatch (only 2 out of 8 eggs hatched) that is not BCM, he said they sometimes through a Wheaton, I don't know if this is true or not, seems they would have to be crossed with a Wheaton. I got 3 out of 8 on the last hatch. That are all BCM with feathered legss.