I'm surprised the fox hasn't been around when they are out.Chicks were out again when I arrived.
Although I had a bunch of 5 weeks old that slipped out and I seen a coyote go by. I ran out and they were in the weeds 3 ft away from where I seen it go by. Not sure if they were really quite or if it was worried about me.
otoh, I can get one easily from the next-door neighbour 
) In case you can't see it, the sixth chick is just visible behind her butt.