Zoey was a fierce and terrible huntress. In the 8 or so years that she lived with me, she brought in many mice, voles and birds (both alive and dead), a rat (dead), a squirrel (dead), a chipmunk (alive), a snake (live), a bat (dead), and a frog (found dessicated under the bed). She would growl menacingly if you tried to take to take the prey away from her (much to her dismay). The mrrr-RRRR -- muffled-sounding due to the prey held in her jaws -- was simply her way of announcing, "Look what I've got! Aren't you proud of me?"
I'm sorry to hear that you've lost some cats to cars, as well. We got Mocha (previous icon) only a month or two after we lost Zoey. She came to us as a declawed, indoor kitty, so it was easy to decide not to let her out. Minikin (this icon) was a stray who we found outside our house. She doesn't seem to mind being kept indoors. Zoey would never have let us do that, though. She was determined to be an outdoor kitty, and would have been miserable if we hadn't let her go outside.
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I'm sorry to hear that you've lost some cats to cars, as well. We got Mocha (previous icon) only a month or two after we lost Zoey. She came to us as a declawed, indoor kitty, so it was easy to decide not to let her out. Minikin (this icon) was a stray who we found outside our house. She doesn't seem to mind being kept indoors. Zoey would never have let us do that, though. She was determined to be an outdoor kitty, and would have been miserable if we hadn't let her go outside.