A sparrow landed in a city park near a black cat sprawled out in the grass. The bird began to chirp, chirp, chirp, in the way drunkards ramble in bars. Clearly irritated, the cat crouched low, its ears back, ready to pounce. After about a minute, the cat relaxed. It must have figured killing the bird would ruin the mellow mood of the day. A moment later, the bird took off and vanished in the trees. The cat flopped itself back into the grass.