The Auckland Islands teal is mainly crepuscular to nocturnal (2), feeding on marine invertebrates, terrestrial amphipods, insect larvae and small molluscs in coastal pools or washed-up seaweed, and also on algae (6). Mated pairs travel and feed together (6) and maintain a territory (2), but may flock at traditional roosting sites when not feeding (7). During the breeding season, these flocks consist mainly of juveniles and non-paired adults (7). The breeding rate and annual productivity is low (6), with clutches of three to four eggs laid from late October, with the first broods appearing in December (2). The gestation period exceeds 30 days in the wild and is 30 to 35 days in captivity, with incubation performed by the female alone, while the male remains close and guards the female whilst feeding during nest relief. Both parents attend to and defend their young throughout the fledging period of 60 to 70 days and both sexes first breed at one year in captivity (2).