Sexual dimorphism of a zebra

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The Cape mountain zebra Equus zebra zebra is a subspecies of mountain zebra that occurs in certain mountainous regions of the Western and Eastern Cape provinces of South Africa. It is the smallest of all existing zebra species and also the most geographically restricted. Although once nearly driven to extinction, the population has now been increased by several conservation methods, and is classified as Vulnerable by the IUCN.

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What do humans and songbirds have in common? Both species can maintain monogamous relationships while at the same time being highly social. In new research with possible implications for human behavior, scientists studying the zebra finch, a type of songbird, found that the same brain molecule, dopamine, can simultaneously promote gregariousness among males and sexual selectivity among females.

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Stripes on plains zebras are regionally variable. Patterns are more prominent in northern populations which lack or have minimal shadow striping. All zebras have a unique arrangement of stripes which can be used to identify individuals.

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Grevy's zebras live in northern Kenya and a few small areas of southern Ethiopia. The last survey in Kenya in resulted in an estimated population of 2, Current estimates place the number of Grevy's zebras in Kenya between 1, and 2,

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Zebra finch cocks and hens can be told apart by their colours. This is known as sexual dimorphism. As in most birds where there is a difference in the appearance of the sexes, the cock is the most colourful.

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Jose M. Riascos, Pablo A. Guzman, The ecological significance of growth rate, sexual dimorphism and size at maturity of Littoraria zebra and L.

Please take this quick survey to tell us about what happens after you publish a paper. Neuroscience Bulletin. To observe the sexual differences in electrophysiological properties of neurons in the robust nucleus of the arcopallium RA in adult zebra finches, and to provide the direct electrophysiological evidence for the sexual dimorphism of birdsong.

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Sex-specific gene expression before the onset of gonadogensis has been documented in embryos of mammals and chickens. In several mammalian species, differences in gene expression are accompanied by faster growth of pre-implantation male embryos. Here we asked whether avian embryos before gonadal differentiation are also sex-dimorphic in size and what genes regulate their growth.

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The explanations some evolutionists give for fur and feather patterns sound like tales of talking animals planning out their new fashion lines. Evolution tries to explain not just what isbut how it got that way. Yet reporters and scientists who believe this often write as if animals determined ahead of time what they would do to get more fit, have more sex, or avoid predators.

If you have ever tried to sex and age the Common or Plains Zebra, you will know it is hard work. Eagle-eyed driver-guides will tell you that the stallions have brighter, more contrasting stripes, but I find that method unreliable. Wildlife researchers and managers tasked with telling the sexes apart can also pick out mature stallions from their more robust build, especially as reflected in their necks, which are thicker than those of mares.


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