Cupulariid bryozoan Fossil Specimen (IMAGE) Smithsonian Tropical Research Institute Caption Stiff setae extend away from the edge of cupuladriid bryozoan colonies, and work in synchrony to allow the colony to "walk" over the sea floor. Credit Aaron O'Dean, Smithsonian Tropical Research Institute Usage Restrictions Credit: STRI License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.