Everyone should have ferrets!
I only have 15 now, but wouldn't be without them. Afterbirths are a funny thing to have to dispose of, my boss used to sling them in the hedge for the foxes/crows which I found odd as you don't want those kind of visitors around your lambing plot!
It's a fine line. The foxes and crows are there anyway, so the theory is that if there's something for them that you don't mind them eating, then they don't have to start stealing things you don't want them to have. But if you take that too far, you just fuel the vixen to have another litter, the cubs to stick around, etc.