Remora
How do suction cups work? Did Caligula get murdered due to remoras? Are remoras good or bad for their hosts? Find out on this episode of Species.
Bibliography: https://docs.google.com/document/d/1y30oSBdF0feRKLpSOVYBZ3PFlHtqSaQ9u25dqBwaPCY/edit?usp=sharing