I recently got some Polish chicks, and some of them have 5 toes, feathers on their legs, and their feathers seem to have a Silkie-like quality to them. But they also have the body type of Polish and have a knob of feathers on the top of their heads. They are different ages, from about 3 weeks to 8 weeks. I'm wondering if its possible for them to be Polish/Silkie crosses? Do different breeds usually crossbreed? Thanks in advance!