Free ranging, oh they will definately cross breed.
I've never seen a goose try mating with a chicken.
Usually if here are guinea hens around the males don't mess with the chickens.
Oh yess, you can crossbreed any of chickens.
I have 4 Silkies bantam, 4 Nankin bantam, 4 silkieXNankin bantam, 9 Jersey Giant, 4 RIR, 1 Leghorn,2 Light brahma, and 2 Amercauana. I have 10 roosters.
What breeds roosters is, 4 RIR, 2 Nankin, 1 Silkie, and 2 or 3 SilkieXNankin.
I hopefully we will get 1 amerucana rooster someday.
im planning to crossbred RIR with Leghorn, Amercuana, and Black Jersey Giant.