Make sure all doors and windows are shut when birds are out.
Make sure all openings on the bird cage doors are secure.
Keep flight feathers clipped or moderately trimmed. Be aware that even if their wings are clipped, they still may be able to fly.
If you want your birds to enjoy the outdoors get them a tether or leash and give them time to acclimate themselves to their new surroundings.
Make sure children are never left alone with a bird and an adult is always present.
Record your birds call or other birds from your flock on a tape recorder or smart phone. Keep the tape or recording on hand if you need to search for your bird. Birds have excellent hearing and can hear up to two miles.