血縁選択説
Sociality in spiders is rare, so cooperativity among them has been studied in order to determine its basis. There are two main hypotheses for the evolution of social behavior: kin selection and group selection. Kin selection, selection favoring the individual and other related individuals because of cooperative behavior, and group selection, selection on traits that are advantageous to groups but not individuals, have been proposed as reasons for cooperativity.