I take them out in a child's play yard, weather permitting, and was inside about to vacuum out the brooder and heard crazy baby chick sounds, ran outside to a hawk flying away. I've seen hawks around, but figured in the city to watch out more for cats, and maybe crows? Thank goodness, it flew away empty "handed"....but I felt so bad for putting them in harm's way. I'll be sure to cover the top from now on, and have my husband make their outdoor run asap. I wouldn't have been able to forgive myself if the stupid bird had gotten any of them.