I don't think the expression "wild untrained human" even makes sense. There haven't been any wild untrained human ancestor since a long time before humans appeared.
Also, most smart animals have persistent knowledge that they pass from one generation to the other.
We are just smarter than those other animals. Tens of thousands of years ago, humans were already a force not to be messed with. Hell, a million years ago our ancestors were already on the business of extinguishing their predators.
There are still wild untrained humans. In most cases, it's a very sad state of affairs when that happens since a lot of child neglect has to occur. But I'd argue that children that have been fed but other than that left alone for 10 years, classify as an "untrained" human.
Also, most smart animals have persistent knowledge that they pass from one generation to the other.
We are just smarter than those other animals. Tens of thousands of years ago, humans were already a force not to be messed with. Hell, a million years ago our ancestors were already on the business of extinguishing their predators.