"Newborn mammals can weigh as little as a dime or as much as a motorcycle. Some receive milk for only a few days, whereas others nurse for years. Humans typical

The first detailed account of post-copulatory sexual selection and the evolution of reproduction in mammals.

A unique interdisciplinary overview of the way mammals reproduce, this volume synthesizes research done by laboratory physiologists, behaviorists, population ec

49 about six months ... to well over a year. If there is only one part of the year that is favourable, such as spring and early summer in the temperate climates