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Giant koala : ウィキペディア英語版
Giant koala

The giant koala (''Phascolarctos stirtoni'') is an extinct arboreal marsupial which existed in Australia during the Pleistocene epoch. ''Phascolarctos stirtoni'' was about one third larger than the contemporary koala, ''P. cinereus'', and has had an estimated weight of , which is the same weight as a large contemporary male koala. Although considered a part of the Australian megafauna, its body mass excludes it from most formal definitions of megafauna. It is best described as a more robust koala, rather than a "giant"; whereas a number of Australian megafauna, such as ''Diprotodon'' and ''Procoptodon goliah'', were unambiguously ''giants''.
The two koala species co-existed during the Pleistocene, occupying the same arboreal niche.〔 The reason for the extinction of the larger of the two about 50,000 years ago is unknown.
==Notes==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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