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The Campbell teal or Campbell Island teal ( Anas nesiotis) is a small, Flightless bird, nocturnal animal species of dabbling duck of the genus Anas endemic to the Campbell Island group of New Zealand. It is sometimes considered conspecific with the brown teal. The plumage is similar to that of the Auckland teal, dark sepia with the head and back tinged with green iridescence, and a chestnut breast on the male, with the female dark brown all over. Its natural habitat is tussock grassland dominated by Poa tussock grass, ferns and . The species also uses the burrows and pathways of petrel species that nest on the islands. They are apparently territorial in the wild, and probably feed on amphipods and insects. The IUCN classifies it as vulnerable.
Captive breeding was initially very difficult to achieve, as no studies on the behaviour of the species had been carried out in the wild and "staff at thus had to experiment with a range of techniques to encourage breeding. Success came in 1994 when Daisy, the only wild origin female to ever lay eggs in captivity, finally accepted a mate. Subsequently, breeding has occurred every year – wild origin males contributed genes by pairing with captive raised females.""Forest and bird", No319, February 2006; "Snow ducks of the Antarctic" by Helen Gummer"
A tiny population of 25 captive-bred individuals was released on Codfish Island / Whenua Hou in 1999 and 2000, already intensively managed and pest-free as an important habitat for the critically endangered kākāpō. In the final phase of the ecological restoration of Campbell Island (cattle, sheep and cats had already been removed), the world's largest rat eradication campaign was undertaken by helicopter drops of more than 120 tonnes of poisoned bait over the entirety of the island's 11,331 hectare area in 2001; this operation successfully removed what was estimated to be the world's densest population of Norway rats (200,000) from Campbell Island and it was officially declared rat free in 2003. Fifty Campbell teal, a mix of captive-bred and wild-acclimatised animals (from Codfish / Whenua Hou), were Reintroduction to Campbell Island in mid-2004, after an absence of more than a century. Subsequent monitoring in 2005 has shown that the majority of these birds are now thriving in their ancestral homeland. By 2011 the species has firmly been returned to Campbell Island, resulting in a reclassification of its threat status to endangered, and vulnerable again in 2020.
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