This book is devoted to recent research on animal behaviour which relates to what an animal does and why it does it. The types of behaviours exhibited are rich and various. Some are genetically determined, or instinctive, while others are learned behaviours. The desire to understand the animal world has made ethology a rapidly growing field, and since the turn of the 21st century, many prior understandings related to diverse fields such as animal communication, personal symbolic name use, animal emotions, animal culture and learning, and even sexual conduct, long thought to be well understood, have been revolutionised