[VladimirGolovin]

Unlike the elephant / mammoth pairing, there aren't any marsupials similar to Thylacine (as far as I know). What surrogate options did you have in mind?

[AvocadosNombre]

I believe there is an effort to use the fat tailed dunnart as a surrogate. https://en.m.wikipedia.org/wiki/Fat-tailed_dunnart