My old apartment had a sliding glass door that opened onto a concrete patio, and when I was home, I would leave it open to let in fresh air and so that Scarlett could come and go as she pleased. One sunny summer day, I had the door wide open and was going about my business in the apartment when, while walking through the living room, I nearly stepped on a small green bird that was laying in the middle of the floor.
While I shrieked and ran around trying to figure out what on earth to do with the bird, Scarlett perched on the arm of the sofa looking, well, like the cat who caught the canary. Eventually I used a plastic grocery bag to pick up the bird, at which point I discovered that it was alive! It seemed scared but unhurt, so I relocated it to the yard, where it cowered for a few hours before departing.
This is the only animal (that I know of) that Scarlett has caught. Even as an outdoor cat, she showed minimal interest in hunting, and this little green bird was the only "present" she ever brought me. These days, Scarlett leaves the only available prey - spiders - to Melly, who enthusiastically dismembers and eats them.