Jean-Pierre Boudot has specialised in the study of dragonflies since the 1980s and is currently a researcher at the French National Centre for Scientific Research. He has travelled extensively across Europe, North Africa and the Middle East to identify dragonflies, gradually establishing himself as one of the best specialists in this field, and he is the co-author of several works devoted to dragonflies. Guillaume Doucet has been studying dragonflies for fifteen years, and his studies have taken him across the world. He specialises in larval ecology and regularly organises training for naturalists wishing to learn more about this area.Daniel Grand has devoted his life to the study of dragonflies. He is the author or co-author of numerous publications.