Fifty years of avian change on Ahuahu, Great Mercury Island

Ahuahu / Great Mercury Island is the largest of the Mercury Islands which enables habitat diversity that supports a diverse avifauna. From a combination of quantitative surveys over the past 15 years and qualitative observations over the past 5 years by permanently resident rangers, we list and describe 62 non-vagrant bird species recorded recently on Ahuahu. Reference is made to change over the past 50 years since the last survey in 1975 and also in response to the eradication of introduced cat