wierd cat sound, what's it mean?

[lat192004]

I wanted to show off my cats latest catch.Please click on the attachment. My girl calico "Sweetie" caught this last night and put it at the foot of the bed. It's a huge centipede, it's the same one last night I threw out the window and I thought it was dead, but it came back! Sweetie has a habit of "warming" the bed a few hours before I retire for the night. She is a true watchcat, another reason I love cats