POLYCHAETES: The Wiggly Heroes is about an interesting marine segmented worm that can be found in all parts of the world. Unfortunately, the worms do not get proper attention for their presence and importance. The security and sustainability of these natural resources depend mainly on the knowledge, awareness, education, utilisation and practices from past to future. This book is an attempt to make a comprehensive coverage on the polychaetes including taxonomy, ecology and utilisation and threats in a global context and an area in Morib, Selangor Malaysia was selected as a model habitat. The overarching intention of the book is for the readers to appreciate the existence of polychaetes, gain a better and deeper understanding of their function and contribution in the marine ecosystem. The content of the book is undoubtedly of interest and value to readers not only in academia but also for those who are economists and those involved in aquaculture, fisheries, land management, and the public.