Having its origins in newspaper columns written over 14 years, this book ranges over many subjects in the sociobiological approach to evolution. An important theme in the book is Dunbar's Number, the number of friends the human being has evolved to maintain at any one time: 150. Dunbar mentions s...
Chapter 12 Farewell, Cousins Species change through the gradual failure of some lineages to reproduce, resulting in a subtle but steady drift in the species’ genetic make-up towards that of lineages that are more successful. Although in most cases these processes are quite slow, an entire species...