From the TV Tropes entry for Solid Gold Poop:
- In the Star Wars Expanded Universe, glitterstim spice, the Fantastic Drug on which many a vast criminal fortune (including Jabba the Hutt's) has been built, is the "webbing" of a species of giant spiders that are only known to live in underground caves on the planet Kessel. The spiders use it to catch and prey on Will-o'-Wisp-like energy creatures that live in the same caves.
- And in the New Jedi Order series, prisoners captured by the Yuuzhan Vong are sometimes fed in this way. The Vong find it amusing. The prisoners try not to think about it, since the alternative is starvation.
I'm not quite following that second example, and can't seem to find it online. Are prisoners fed Will-o'-Wisps? Fed to the spiders? Something else?