The cats themselves are quiet, just a few meeps here and there as they try to tear each other's ears off or de-fur one another's tails. What is not quiet is the bang-clanking they do as they rip around the house trying to pop their spay stitches. They slam into the basket of cans for recycling. They climb through stacks of magazines sending them splatting down on the floor. They do their level best to tear down the shower curtain. They flip over and inspect every shoe and boot in the hopes of finding a left over mouse or shrew to lord over a rodentless opponent. And on and on and on. They are currently each "sleeping" with one eye open.