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 argu

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. It's sad, but they do exist. See also: https://en.wikipedia.org/wiki/Feral_child https://en.wikipedia.org/wiki/Feral_child (thanks boatswain for providing the link in another comment)