While the thylacine has been declared extinct for some time, it seems that we just don’t really want to believe its true. Reported unconfirmed sightings continue, and now scientists are proposing that they may be able to use DNA to test traces of the thylacine in areas where reported sightings occur:
http://www.abc.net.au/news/2017-07-11/dna-may-hold-key-to-thylacine-existence-lab-tech-says/8697100