Hee hee - I LOVE that little "kack kack" sound they use for prey! Oh, how the kitty and I would love to live in a warmer climate, so we could keep the windows cracked open in the winter! My kitty is glued to the windows all year round, even when it's 6° out like it is today! (My pleated blinds in the family room also show end damage from a very persistent kitty....)