I have 4 chickens and a good size back yard. They are about 4 months old and have begun to lay. I also have children at my home ranging in age from 1 year to 13. Is it safe to let the chickens free range if the kids still play in the backyard? Do I need to worry about salmonella that way? Should I just clip their wings and wire fence them in an area so they have some freedom? Any ideas and tips would be great. Thank you