What is Chatham oystercatcher?
{{Speciesbox | image =Haematopus chathamensis, Rangatira, Chatham Islands 1.jpg | status = EN | status_ref =<ref name=IUCN>{{cite IUCN |url=https://www.iucnredlist.org/species/22693632/155215731 |publisher=The IUCN Red List of Threatened Species |title=Chatham Oystercatcher: ''Haematopus chathamensis'' |author1=BirdLife International |accessdate=August 30, 2021 |volume= 2017 |page=e.T22693656A118496303 |doi=10.2305/IUCN.UK.2017-3.RLTS.T22693656A118496303.en}}</ref> | status_system = IUCN3.1 | taxon = Haematopus chathamensis | authority = (Hartert, 1927) | range_map = |synonyms= | synonyms_ref= }} The '''Chatham oystercatcher''' or '''Chatham Island oystercatcher''' (''Haematopus chathamensis'') is a bird in the family [[Haematopodidae]]. It lives in only on [[New Zealand]]'s [[Chatham Islands]].<ref name=NZB>{{cite web|publisher=New Zealand Birds|url=https://nzbirdsonline.org.nz/species/chatham-island-oystercatcher|accessdate=August 30, 2021|title=Chatham Island oystercatcher: ''Haematopus chathamensis'' Hartert, 1927}}</ref> ==Appearance== Its body is smaller and thicker than the [[variable oystercatcher]]'s, but they both have black and white feathers. ==Habitat and actions== Chatham oystercatchers live in pairs. These pairs will fight other Chatham oystercatchers over good places to look for food and build nests. This bird builds nests on rocky coasts. It likes sheltered coasts the most.<ref name=NZB /> The male and female bird both sit on the eggs. There are 1-3 eggs [[clutch (eggs)|at a time]]. Male and female oystercatchers usually stay partners their whole lives, but sometimes they do not.<ref name=NZB /> ==Food== Chatham oystercatchers use their beaks to dig in the sand for [[amphipods]], [[polychaete]] worms, [[ribbon worms]], [[mollusc]]s, [[crustacean]]s, [[echinoderm]]s, [[ascidian]]s, and [[anemone]]s.<ref name=NZB /> ==Threats== In the 1970s there were as few as 50 Chatham oystercatchers alive on Chatham Island (and others on other nearby islands). By 1998, there were about 140. Cons