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In combination with predation and competition for resources, infectious disease is a key ecological factor that influences the evolution of animal mating and social systems. Studies also illuminate the central role that infectious disease plays in the lives of some mammals.

The kings of Spain forbade foreigners and other 'undesirables' to immigrate to Spanish America. They saw aliens as threatening imperial, religious and mercantile security, and it might therefore be assumed that the Spaniards were xenophobic and intolerant. Dr Nunn's study shows that statutes tell only part of the story. In the years 1700 60 some 3 per cent of the foreign-born in Mexico were non-Spaniards who had entered the colony illegally. Who were these people, where did they come from, and what were their motives? In answering these questions, Dr Nunn demonstrates how illegal immigrants...

The kings of Spain forbade foreigners and other 'undesirables' to immigrate to Spanish America. They saw aliens as threatening imperial, religious and mercantile security, and it might therefore be assumed that the Spaniards were xenophobic and intolerant. Dr Nunn's study shows that statutes tell only part of the story. In the years 1700 60 some 3 per cent of the foreign-born in Mexico were non-Spaniards who had entered the colony illegally. Who were these people, where did they come from, and what were their motives? In answering these questions, Dr Nunn demonstrates how illegal immigrants...