it could be that they have their own graveyards deep in the jungles.....they could bury their dead, burn them, dump them in the oceans/lakes for all
we know.....
Not a whole lot of jungle in the area these things are allegedly sighted.
As for the bone record, (wouldn't have to be fosilized if bigfoot is a living creature) I propose 3 explanations why bone evidence has not been
discovered.
1. The creatures are a myth. Seems the most logical and if I were a betting man I would go with this option, though we will never be able to prove
this conclusively.
2. It is a statistical quirk that we simply haven't happened upon any of their bones in a well populated country with people actively looking for
just such evidence. If bones were found accidently, they would be either mistaken as human remains, or people would instantly jump to the bigfoot
conclusion. Either way it would be all over the news.
3. The bones are destroyed or hidden. One possible way the bones could be destroyed is if they were made into tools. The breaking, grinding,
shaping, and polishing would likely distort the bones into being unrecognizaeble as "bigfoot" bones and also decrease the likelyhood of them being
found, as the tools would most likely be carried around. As for the hypothesis of burning the bones, this seems unlikely to me. The temperature
required to make bone ash is around 1100 degrees celsius. A fire that big would not only be easily visible, but would also leave a trace long
afterwards. Alternatively, if the bones were hidden it would most likely be based on the culture of the creatures. It would stand to reason however
that any group significantly large enough to have a culture would have a harder time remaining hidden, which someonewhat lessens the probability of
this being a valid explanations.