Populations of low genetic diversity (Furlan et al.Genetic evidence of connectivity between coastal and inland areas separated by the Great Dividing Range (Furlan et al.Regional differences among mainland platypuses (Kolomyjec et al.Little genetic differentiation within Tasmania.Reflects long-term isolation of Tasmania from mainland Australia.

Platypuses in Tasmania/King Island genetically distinct from platypuses in mainland Australia (Furlan et al.May be transient, non-breeding individuals.Uncommon reports of platypuses in South Australia (Grant 2007).Local declines and extinctions reported, especially in urban and agricultural areas (Grant 1992).Large declines in Victoria and New South Wales (Grant 2015 Woinarski and Burbidge 2016).Population declines in all major mainland drainage basins (Hawke et al.Total population: declining (Woinarski and Burbidge 2016).Approximately 110 individuals (Furlan et al.Localized declines may go undetected (Gust and Griffiths 2010 Woinarski and Burbidge 2016).No study of nearly half of the platypus's potential range (Hawke et al.Lack of systematic, rigorous monitoring studies some recent initiatives beginning to change this.2012 Grant 2015 Woinarski and Burbidge 2016, except as noted) No robust estimates of total population size (except Kangaroo Island) (Furlan et al.Today's populations thought to number in the thousands or tens of thousands (Grant 2015).Platypus has experienced large declines since 1890s (Hawke et al.Until recently, considered common over much of its range (except South Australia) (Grant 2015), but growing evidence of higher risk of declines and local extinctions than previously thought (Bino et al.Abundance difficult to quantify (Woinarski and Burbidge 2016).

Are platypus endangered species