The black part in the crease of their rump is much broader and longer on a mare than on a stallion. Since both male and female Zebras are of similar size and weight this cannot be used as a method to differentiate between the sexes. Males tend to be much more active than female zebrafish. The search for those reasons is a task for the future. In contrast, the male is pale blue, with the zebra pattern of multiple thin, dark, vertical stripes. As you can see in the two photos above a stallion's genitals are tucked up high between the hind legs of the male Zebra If the Zebra is facing away from you, look at the black part between their hind legs coming down from their tail. The typical body shape of a male zebrafish is very slender compared to that of the female.
There have to be other explanations for individual partner preference than genetic relatedness or early sexual imprinting. "So far, both mechanisms have been overestimated as factors for partner preference", says Wolfgang Forstmeier, one of the co-authors of the study. Both, the genetic and the foster sisters did not show more conformity in their partner preferences than females that are unrelated and raised separately. which male to prefer - the researchers did not find any influence of genes or sexual imprinting. Regarding the preference functions - i.e. The Max Planck researchers found that the choice behavior of zebra finch females is partly influences by genes: genetic sisters chose their partners in a similar way regarding their activity pattern, the time spent with a male and the proportion of visits of the different males. When the zebra finches reached sexual maturity, the females could choose between two unrelated males in a set of experiments. This is why the researchers were then able to compare mate choice and mate preference of genetic sisters and foster sisters. More than 350 zebra finch chicks of one generation were raised with unrelated foster sisters from unrelated foster parents.
Male and Female Zebra Finches feed simple seeds and small fruits. The researchers used an elaborate experimental design to separate the influence of genetically determined preference and the experiences made in the early life phase. Male and Female Zebra Finches are the same size. Scientists from the Max Planck Institute for Ornithology in Seewiesen investigated for the first time the relative importance of the two factors for mate choice. This means for example, a female prefers a male that resembles her father. These mating preferences can be heritable or they can result from sexual imprinting. Thereby, each female has her own individual preference - not different to us humans. As in most animals, it is the zebra finch female that chooses the mating partner.
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