[Campion]

Do their dead bodies and skeletons disappear as well?

[Rockingham]

The working assumption is that they care for their sick and bury their dead, just as Neanderthals and early protohumans seem to have often done. Notably, extinct species have a surprising tendency to hang on and then reappear.

I once saw a Florida panther in the wild in the 1970s after the species was officially extinct and before its recovery. In that interval I was told by no less than three of the state's best official wildlife experts that it was beyond question that I was mistaken. Several hunters and trappers though told me of also seeing extinct Florida panthers in the wild.