one of these is a black sex link I know for sure because I already have a 4 year old hen, and I got this one out of the black sex link bin! It has a super rusty chest and yellow legs. But the other two came out of a black silkie bin,which they clearly are not. They have black/slate legs, and a tiny bit of rust on their chests but none on they backs or anything. I'm guessing they are more black sex links but they look nothing like the other one and I got them all at the same time in 2 different bins.