Before revision: It has been observed in many non-human animals (see sperm competition), as well as humans.Alberts, S. C., Altmann, J., & Wilson, M. L. (1996).
After revision: mate guarding andIt has been observed in many non-human animals (see sperm competition), as well as humans.Alberts, S. C., Altmann, J., & Wilson, M. L. (1996).