What Females Tell Males About Their Reproductive Status: Are Morphological and Behavioural Cues Reliable Signals of Ovulation in Bonobos (Pan paniscus)?

By Karin E. Reichert, M. Heistermann, J. Hodges, Christophe Boesch, G. Hohmann. 2002

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Timing and probability of ovulation in relation to sex skin swelling in wild West African chimpanzees, Pan troglodytes verus (2003, methodology): “Using this approach, we obtained a high degree of objectivity and interanimal comparability in rating perineal swelling changes (see also Heistermann et al. 1996; Reichert et al. 2002).”
Intra- and inter-sexual aggression by bonobos in the context of mating (2003, background): “In bonobos assessment of fecundity is difficult: Variation of sexual attractivity of females across different swelling phases is modest (Kano, 1996), ovulation may occur at different cycle stages (Reichert et al., 2002) and information on birth intervals suggest that lactation”
Multiple ornaments correlate with aspects of condition and behaviour in female northern cardinals, Cardinalis cardinalis (2004, background): “…of condition, that males assess female ornamentation, and thatmales prefer more ornamented females as mates (Hunt et al. 1999; Roulin 1999; Amundsen 2000; Amundsen & Forsgren 2001; Berglund & Rosenqvist 2001a; Domb & Pagel 2001; Reichert et al. 2002; Romero-Pujante et al. 2002; Weiss 2002).”