I wish more textbooks were like this. The only one that really comes to mind is Animal Social Behavior by Wittenberger. Like that one, this book impresses by the quality of the arguments. He never just comes up with 'this is the way it is, so learn it'. He often presents an hypothesis, then lists predictions that can be made from that hypothesis and suitable tests, and then evidence to support or disprove it. You learn something about the scientific method as well as the subject matter.
I admit I dismissed evolutionary psychology for a long time, arguing that we are no longer subject to darwinian evolution, but are subject to rapid cultural evolution. However, this book shows exactly why I was wrong, and how much we can learn from the sort of interesting questions that an evolutionary perspective inspires.
A nice antidote to the influence of behaviourism, which still seems to be present in sociology and feminist ideology. Just so long as we remember that not all behaviour is an adaptation.