The natgeopristineseas and The RSPB joint marine expedition to the UK Overseas Territory of Tristan da Cunha has just arrived at Tristan after seven days at sea, to be greeted by these beautiful Antarctic terns . Read the first of our team's updates from the field here: natu.re/2k18vxf (Photo by Andy Schofield, RSPB) #TristandaCunha #tern #SouthAtlantic #conservation