Yes, I had big tom that adopted me and I had the door open, and I was working one day when there were all these ripping sounds behind me. When I turned around, it was all about feathers.
Old Randy (Rottie mix rescue) would eat birds when he could get them. I once walked out on the back porch, and found two irridecent green parakeet wings. Nothing else... no feathers... nada. Randy ate someone's Tweety. Probably in a single gulp.
/johnny