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Comparison of mating behaviour between more female-biased pairs (both individuals originated from pairs) and more male-biased pairs (both individuals originated from octets). Means for (a) copulation number, (b) the average copulation duration and (c) the relative number of sucks (i.e. corrected for the number of copulations) are depicted from mating trials that lasted 2 h. Bars indicate means ± s.e.
