Fantastic footage of the crodyceps fungus.
Cordyceps Sinensis affects catepillars, forcing them to commit siucide by falling from height to their deaths.

The mushrooms from sinensis have been harvested from central asia by the chinese, who use them for increasing yang.
Enough is harvested to stuff into a duck, which is then boiled.
Parasite-fungus stuffed boiled duck. More potent than ginseng.
This has been done for thousands of years.

I swear I'm not making this shit up.

You can buy something from chinese health shops around auckland, called "Dong Xia Cao",
This is industrially produced sinensis.