On velvet paws

Your kit sits quietly on your knee
While you brush and groom her silken fur,
Accepts a ribbon around her neck,
Subsides into a contented purr:

 A perfect house cat. Yet I saw her
Yesterday, creeping over the verge,
Belly to earth, lifting paw by silent paw,
Living her own life,gripped by the urge,

The killing urge,to do as cats must do.
No prey I saw - no bird, vole or mouse -
But she sprang, clapped paws twice,leapt,and slew
A cricket! Oh, velvet killer of your house!