The purpose of this book is to elucidate the general principles
underlying animal aggression. Aggressive encounters occur even in very
simple organisms, and are at the roots of human conflict. A general
framework is provided by dividing forms of aggression according to their
function - protection of the individual, offspring defence and
competition. Within each functional group, the principles underlying the
variety of aggressive behaviour in different species, the sexes and
different life-cycle stages, are considered, and this is followed by a
discussion of the mechanisms through which animals achieve the various
functional ends. Aggression is viewed as one possible solution to a
recurrent set of problems animals encounter in their natural
environments. In any one case, the control and form of aggression are
seen as the result of the interaction of past evolutionary environments,
developmental influences and current circumstances.