I live in a subdivision surrounded by woods and farmland. We can hear the coyotes at night and have seen them a block away. As a result, my ducks are locked in a covered pen from dusk to dawn. During the day though, they free range in a 15 x 50 ft garden area until I get home and then they get the whole fenced yard (only because if they are out when I am not home they prefer my swimming pool). I think the risk is worth it. They are healthier getting to catch bugs, find worms, and eat dandelions and crabgrass they find in the lawn. The predator I worry the most about is hawks which fly over frequently. My neighbor put up two purple Martin houses this summer and I have seen those Martins chase off Cooper and Redtailed hawks. Their squawking at danger also helps alert my birds to hide. I say all this to say, yes, it is a gamble, but for the last year and a half all has gone well. Give those babies some room to move and consider putting up some Martin houses.