Edited by: Prof Daniel Costa, Dr Yan Ropert-Coudert
This thematic issue collects scientific articles that were presented at the 5th International Bio-logging Science (BLS) Symposium, held in Strasbourg in September 2014. BLS symposia foster scientists that work with data-recording devices embarked onto freely living animals, including human, to record biological activity of the carrier and/or the physical parameters of its immediate surroundings. Besides methodological, technical and analytical aspects, BLS is also interested in promoting the scientific advances obtained through the use of bio-loggers. As such, the diversity of the BLS presentations meant that the Proceedings had to distribute over two BioMed Central journals: 
Animal Biotelemetry and 
Movement Ecology.
Animal Biotelemetry: Dan Costa and Christian Rutz.
Movement Ecology: Yan Ropert-Coudert, Akiko Kato and Mark Hindell
