Understanding animal behaviour is the overall theme of this 51st Congress of the International Society for Applied Ethology and the red thread through the chosen scientific topics. Understanding animal behaviour is essential in order to improve the interaction between animals and the environments in which they are kept and to improve animal welfare. The abstracts in this proceedings book give an overview of the scientific topics discussed at the conference. The world of animals: senses and perception Human-animal interactions Animal learning and cognition Animal stress responses Social...