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According to a research done by Thomson, Mitchell, Eberhard, Dortch, et al, through the analysis of fossil records and early European explorers it has been found that there were three island forms of emus of the genus Dromaius: the King Island emu ( D. ater), Kangaroo Island emu (  D. baudinianus) and Tasmanian emu ( D. n. diemenensis). During the nineteenth century, these island forms were extinct. However, the Dromaius novaehollandiae and Dromaius ater are conspecifics. They are extinct and there are little to no information about the Tasmanian and Kangaroo emus. After thorough genetic and morphological analysis, these species were found to be an isolated population/subpopulation of mainland emus, so their dwarfism may be the result of different resources that were available and phenotypic plasticity.

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