What happened to my sweeties ?

About a month ago my sweet Bernedette went missing...no sign of anything just gone....I thought maybe she was off brooding in hiding she would be my smartest chicken and the only one to think of it....well no signs of her yet. And yesturday I went to TSC to pick up some chicks for my broody silkie and when I returned a small pile of of my most sweestest lil easter egger girl's ( she just started laying a few weeks ago) feathers , what in the world took my babies, both times it has been a dark colored girl and the only ones that would let me pack them around while I loved on em' . My chooks love to free range and I don't want to keep them locked up when it is nice out, I feel terrrible... usually if they are out and I need to run an errand I will lure them back into the run with treats before I leave.... so I was not going to be gone long and figured they would be ok....and this is what happens , never again . There was no blood just one pile of feathers. We have hawks around, but some say they can't take off with a chicken..........but I was wondering I have heard an owl ever now and then not all the time at night around here in the woods behind our home. It was daylight when they were taken. My Sophie girl even takes her new chicks out to free range and whatever it was didn't even bother a chick . Anybody else have this happen and did you find out what is was?