Watch VoirFilms. Join Australian Museum and UNSW Sydney PhD Candidate and Nat Geo Explorer Tim Cutajar as he searches for the feared-extinct Southern Gastric Brooding Frog (Rheobatrachus silus) in the Sunshine Coast hinterland. Using environmental DNA, Tim and the team are trying to detect any trace of this species, which has been missing since the early 1980s. Taking samples from water, air and frog-biting, blood-sucking flies, the team are trying to forensically detect this missing species.