An actual 6 year-old asked me the question today. I was at a loss.
**Edit**: a lot of interesting answers, food for thought, and ideas on how to explain it to a child. Many thanks to the community!
If I summarize:
* Dinosaurs lived for a very (very) long time, all over the earth, and there were countless different species of them.
* There were few of our ancestors, from just a few species, and most of their existence was confined to limited geographical areas.
* The conditions for a fossil to form are extremely rare, and they may have been even rarer for our ancestors than they were for dinosaurs.
In: 819
The prevailing theory of asteroid cataclysm would explain the piles of bodies as tsunamis sweetheart earth and left then in berms of debris. They were covered with the settling dust which helped preserve them.
Hominid were mostly cave dwelling. It is quite likely that succeeding bands would have cleaned house when moving in. A good cave is a good cave even if it needs fixing up.
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