Viscous Circle
From the back cover:

In the far, far future the bloodthirsty Solarians, in their rage to find the mysterious Ancient Site, are determined to wipe out the Bands, a strange and beautiful species whose society is an anarchy of peace.  Only Rondl, the whirling green Bamd, can save his race, for he has a singular and awesome knowledge.  But suddenly Rondl makes a shocking discovery about his identity -- a discovery that may cost him his honor, his beautiful lover Cirl, even his very life.

THE GALACTIC ANNIHILATION IS BEGINNING!
Science fiction, Fiction, general
Piers Anthony
Piers Anthony was born in Oxford, England.  When he was four years old, his family immigrated to the United States.  He graduated from Goddard College in Vermont in 1956, the year he met and married his wife, Carol Marble.  After working at odd jobs, he joined the U.S. Army in 1957 for steady income and medical insurance.  In 1958, he became a U.S. citizen.  He became an editor and cartoonist for the Battalion newspaper.  He left the army in 1959 and briefly taught public school before becoming a full-time writer.  Anthony currently lives with his wife on a tree farm which he owns in Florida.