Mark Leed

The bone piles are left by one species. The x structures are left by a different species. We call them both bigfoot. But they are quite different from one another. The meat eaters are killers and preditorial. They hate humans. The others build structures to make them aware of areas not to enter.The structure builders are more powerful. They would kill them if necessary. They will also protect the humans. But prefer to attempt to escort humans out of the area.