page_title: Chatham gerygone
section_title: Breeding
hierarchical_section_title: Chatham gerygone / Breeding
caption_attribution_description: English: Chatham Island warbler, Gerygone albofrontata (AM LB2070) nest from the collection of Auckland Museum
context_page_description: The Chatham gerygone or Chatham Island warbler is a species of bird in the family Acanthizidae. It is endemic to the Chatham Islands and thus not found on the mainland, where its relative, the endemic grey warbler, is found. The Chatham Island warbler is larger and sports different plumage for the male, female and juvenile birds. Both warblers were discovered and named by G. R. Gray in 1845. The grey and Chatham Island warblers are the only two members of the Australasian family Acanthizidae found in New Zealand.
context_section_description: Chatham Island warblers are solitary nesters, with defined territories defended against conspecifics. Disputes are mainly carried out by the male birds, and you can observe long chases occurring when boundaries are threatened. Although very territorial, boundary disputes never result in contact. The warblers are monogamous and the same breeding territories have been known to be defended for up to three years in a row.
  The breeding season for these warblers varies from year to year, but can be seen to average from around September to January. The nest style produced is the enclosed pendant, very similar to that of the grey warbler. The female birds are the sole nest builders, and incorporate mosses, lichens, leaves, bark, feathers, small twigs and spider webs into the nests. The nests are also seen to be lined with soft feathers. The location of the nests differs depending on the island. Nests on the largest island tend to be hanging freely in the open and in gaps of vegetation, while nests on the surrounding islands are in dense foliage.
  The female is in charge of brooding, and her eggs are an off-white colour flecked with reddish brown. On hatching, both male and female contribute by feeding the chicks. The Chatham Island warbler has a high breeding success rate of 87%, significantly higher than the mainland grey warbler which sees only 38% breeding success.
caption: Chatham Island warbler nest from the collection of Auckland Museum
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