Our four chickens free range around the yard during the day, and are locked up safely at night. This evening around dusk, my husband looked out the window and saw a neighborhood cat "stalking" the chickens! Should we be worried that this cat could hurt our chickens? I know to be careful of raccoons, foxes, dogs etc. But cats??? Really? If so, does this mean they should not be out during the day? Bummer!! Thanks for the help!