version 3 by Jon Ingold
Section: Group Descriptions
To provide a description for examining members of a kind, the "group description" property is used:
A key is a kind of thing. The group description of a key is "A bunch of brass keys."
A dog is a kind of animal. The group description of a dog is "A pack of wild dogs, all slavering at the teeth."
Note, it will only be printed in response to plural enquires, so you are safe to hard-pluralise the response.