This tiny snail was declared extinct but found alive on Norfolk Island in 2020; just 46 founders launched a breeding programme that has now returned more than 1,300 to the wild

• The Campbell’s keeled glass-snail (Advena campbellii) had not been seen for decades when Norfolk Islander Mark Scott found large, unusual shells while surveying for rare plants.
• He contacted the Australian Museum, and in March 2020, malacologists including Dr Isa