Feather Duster Question

How do you tell if a feather duster is still in the world of the living? One of
mine hasn't shown a cluster of "feathers" for several days now and may have shed
them. I moved him out of a cave in the rocks onto the sand, and he apparently
didn't like it.

There are no visible changes to his body over the last few days; he hasn't begun
to decompose or anything. Any idea how long it takes one to regrow a feather
cluster?

George Patterson
Forgive your enemies. But always remember who they are.