This is a wonderful introductory textbook. It provides a good overview of the different aspects of behaviour in animals, and it doesn’t assume any pre-existing knowledge, so nearly everything is explained and defined. It also provides definitions of key terms in orange boxes on the page margins, which I really appreciate because it breaks up the text and makes it easier to extract really essential information. Furthermore, there are short summaries of case studies, ideas for discussion points, and it also engages the reader — it tries to get you to think about questions to ask and how you could design an experiment to answer those questions.