Голоса панд: B. Charlton et al., “Vocal Discrimination of Potential Mates by Female Giant Pandas (Ailuropoda melanoleuca),” Biol Lett 5 (2009): 597. Голоса женщин: G. Bryant and M. Haselton, “Vocal Cues of Ovulation in Human Females,” Biol Lett 5 (2009): 12; к сноске: J. Knight, “When Robots Go Wild,” Nat 434 (2005): 954.