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<sod>The quokka population on Rottnest Island is 8,000–12,000 (2008). Snakes are largely the quokka's only predator on the island. The population on the smaller Bald Island, where the quokka has no predators, is 600–1000. There are an estimated 4,000 quokkas on the mainland, with nearly all mainland populations in groups of less than 50, although there is one declining group of over 700 in the Southern Jarrah-Karri Forest.<ref>{{cite web|url=http://www.environment.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=229 |title=Setonix brachyurus — Quokka Glossary |publisher=Environment.gov.au |date= |accessdate=2016-08-25}}</ref> In 2015 the massive Northcliffe bushfire decimated one of the local mainland populations, with an estimated 90% or 500 quokkas dying.<ref>http://www.abc.net.au/news/2016-09-06/northcliffe-quokka-population-decimated-after-2015-bushfire/7818884</ref>  At the end of summer and into autumn, the quokka population on Rottnest Island dies off due to lack of water, a limiting factor there.<ref>http://www.abc.net.au/news/2016-10-17/quokkas-rottnest-island-smile-but-island-life-no-paradise/7930208</ref><eod>