Some Bacteria Trigger Swarming Behavior (VIDEO) University of California - Berkeley This video is under embargo. Please login to access this video. Caption Choanoflagellates swarm after exposure to the bacterium Vibrio fischeri (right), but not after exposure to the control bacterium Echinicola pacifica (left). Credit Arielle Woznica and Nicole King, UC Berkeley Usage Restrictions None 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.