Theoretically, what animal could become totally extinct... then re-appear?

People have worked toward, and still work towards replicating the dna of The Thylacine, in hopes of re introducing the animal to it's natural habitat in Tasmania via clones.

In general I think any animal that lives in a remote, hard to access wilderness area might become so rare that it is declared extinct. Then it might seem to re-appear when it's population recovers and there are enough of them that they spread to the edges of that remote area, where they are seen again. The Ivory-billed Woodpecker is a good example.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.