No.
These guys:
http://wh40k.lexicanum.com/mediawiki...d_Thirster.JPG
Daemons are entities of the warp, and servants of the Gods of Chaos. They are created at the whim of a Chaos god from a fraction of the god's own power and act as an extension of their will. A daemon's appearance and character reflect the god's own nature. These daemons may be reabsorbed into the god at whim.

