Great shearwaters ardenna gravis in the eastern indian ocean: A photo-documented record and summary of recent sightings

A Great Shearwater Ardenna gravis, observed and photographed off Amsterdam Island, on 2 February 2017, was a rare but not exclusive sighting of this species from the eastern Indian Ocean. We summarize the occurrence of this species in the southern Indian Ocean based on surveys conducted during the period 1985–2017.