books.google.co.uk - Why do males of some species live with a single mate when they are capable of fertilizing more than one female's eggs? Why do some females pair only with one male, and not with several partners? Why do birds usually live in pairs and feed chicks together whilst mammals often live in larger groups with...https://books.google.co.uk/books/about/Monogamy.html?id=zIu2K6KFsXEC&utm_source=gb-gplus-shareMonogamy
