I am so sorry you've lost your chickens. That is always such a sad thing. It would seem that everything likes to eat chickens (even dogs - Molly's nickname is chicken killer). We don't clip our chicken's wings for that reason, don't want to impede them from any chances they have to escape predators. Eventually, you'll get all the kinks worked out - its always unique for everyone as we are all dealing with different environments, structures, and predators.