Scientists have been left baffled by a 'zombie' fish.
Fishes
The southern purple-spotted gudgeon had been declared extinct back in 1998 but one was recently discovered in a lake in Australia.
The sighting led to an investigation in which 79 of the fishes were recovered nearby.
The creatures, which have been nicknamed 'zombie' fishes by wildlife experts, are now set to be revived through a captive breeding programme.
Adrian Martins, from Victoria's Environment, Land, Water and Planning Department, said: "Most of our team have worked their whole lives dealing with the decline of threatened or endangered species, so to have an opportunity to be witnessing the opposite is something special.
"This is a really incredible and exciting find.
"We couldn't believe it when we started finding so many at Middle Reedy [lake]."