Flying populations in Falkland Is, hitherto classified as T. patachonicus, recently found to be “genetically indistinguishable” from flightless populations of present species on same islands, with the inference that the flying and flightless birds belong to a single, partially flighted species#R, but further study required to confirm these findings; flightless populations breed along coast, unable to reach inland freshwater lakes where flying populations breed almost exclusively, so hybridization is unlikely to be the cause of genetic similarity, and indeed reproductive isolation may ultimately lead the two forms to diverge further. In a separate recent phylogenetic study, present species was found to form a clade with T. pteneres (using a captive individual of latter)#R. Previously considered to form a superspecies with T. pteneres and T. leucocephalus. T. brachydactyla is a synonym. Monotypic.
Food and feeding
Status and conservation
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