Cooperative display and relatedness among males in a lek-mating bird.

  title={Cooperative display and relatedness among males in a lek-mating bird.},
  author={David B. McDonald and Wayne K Potts},
  volume={266 5187},
Long-tailed manakins mate in leks and cooperate in multiyear male-male partnerships. An alpha male is responsible for virtually all mating, whereas a beta male assists in the courtship displays. Such altruism by the beta male poses a problem for evolutionary theory because most theoretical treatments and empirical examples of cooperative behavior involve kin selection or reciprocity. Here it is shown that alpha and beta partners are not relatives and that reciprocity is not involved. Instead… CONTINUE READING

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