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Development of wetlands

Conversion of the land for farming more than a hundred years before Tahi's establishment had included draining of all wet areas and the channelling of all streams. Thirteen wetlands have been produced, ranging in size from a few square metres to up to five-hectare lakes. The large coastal dune lake has been refilled to the level allowed, without flooding the main road. The estuarine salt marsh, home to a remnant population of fernbirds, has been reinstated after it was drained and blocked from seawater.

The consequence of all this wetland creation and restoration has been a large increase in the number of birds at Tahi. Some of the rarer birds have returned; these include the bittern (Botaurus poiciloptilus), pateke or brown teal (Anas chlorotis) New Zealand's rarest duck) and the grey duck (Anas superciliosa), as well as many other rare and common species. Fernbirds (Bowdleria punctata) and many other species have increased and spread across many habitats within the Tahi area. In addition, the wetlands help recharge groundwater and assist in the numerous droughts.