Po werm are small multilimbed fast moving animals with highly attuned senses, particularly to scent and heat. They have a chameleon-like ability to change their color to match their surroundings.

The Changeling Odo once took the form of a Po werm to avoid detection en-route to rescuing hostages from Parasite infected Bajorans in the Bajoran Parasite crisis of September of 2376. (DS9 novel: Unity)