No hawks, no birds larger than a sparrow, no owls, no skunks, raccoons, an occasional possum in the barn that the dogs kill quickly. I do have bird netting that I used in the chicken coop, that will keep the sparrows out. The buns are not out year round, and there is a large tree that offers shade in the summer, and they have plastic dog crates to go into. I hate the snow and wind, so everyone comes back in after the first frost. Usually the area is only used for grow outs, but I have an older doe who has not conceived, it was suggested to put her in a colony situation. Actually, in the few days she's been out there, she had been a kinder, more sociable bunny. She seems no longer afraid of me.
Building permanent structures in the city and on this property is kind of a no no. I sank the posts but a room would make it permanent. Also, the sky is my only source of light.