The propensity to show moral behaviour has evolved in all animals living in complex societies as it promotes social stability. All major religions provide a structure for a moral code. The code is valuable in the societies where the religions have influence. The most important aspects of morality are the same in all countries. Because of their moral code, people consider that they have obligati...

Here, I provide a guide for those new to the burgeoning field of animal welfare science as to what this comprehensive, relatively young discipline is all about. Drawing on all branches of biology, including behavioural ecology and neuroscience, the science of animal welfare asks three big questions: Are animals conscious? How can we assess good and bad welfare in animals? How can we use science...