Males were preferred to avoid complications of the estrous cycle.
Additionally, in zebrafish, it was indicated that while males were preferred less by other males, both sexes were attracted to females (Ruhl and McRobert 2005).
The inclusion criterion was to sample at least one male from each compound in the village, two males were preferred where available, and closely related individuals such as father son pairs were randomly included.
When, for example, Drosophila flies, some with yellow bodies as a result of spontaneous mutation and others with the normal yellowish gray pigmentation, are placed together, normal males are preferred over yellow males by females with either body colour.
Among three pairs of males, the same male was preferred by all tested females (n = 5, 6, and 7 females, respectively) and equal mating success of the two alternative males was rejected with P values <0.05 (Fig. 2).
Consequently, this variable was not used in multivariable analysis and presence/absence of an adult female and presence/absence of an adult male was preferred as an indicator of gender structure of the household.
Little et al. (2010) found that digitally masculinized male faces were preferred more strongly by reproductive-age women than by pubescent girls or postmenopausal women.
As female mice of any strain are generally less aggressive toward each other and are less apt to fight than the male mice, they were preferred for studying GO treatment during OVA sensitization and/or challenge.
Female CHWs were preferred although males were also accepted.
Women were preferred, although males were also accepted (women and men can serve as VHT members according to the national strategy).
The effect of rank may also explain why stimuli of female individuals were preferred over males: as females are usually lower in rank (Braun & Bugnyar, 2012), a possible interaction of rank and sex could explain this result, but this needs to be tested with a larger sample size and preferably also in other populations.
