Sport junkie or couch potato? Always on time or often late? The animal kingdom‚ too‚ is home to a range of personalities‚ each with its own lifestyle. In a study just released in the journal PLOS Biology‚ a team led by Sren Hfker and Kristin Tessmar-Raible from the Alfred Wegener Institute‚ Helmholtz Centre for Polar and Marine Research (AWI) and the University of Vienna reports on a surprising discovery: Even simple marine polychaete worms shape their day-to-day lives on the basis of highly individual rhythms.