The Terraforming Worms of Earth

I have had a very limited understanding of worms. As a gardener, I think they’re great. As an odd person who thinks about terraforming other planets, I’ve figured that worms should be part of the tool box for making a place more like Earth; and, in fact, they provide a moment of joy in Out of the Dell as someone sees them outside the lone terraformed valley on the alien planet.

But there are different kinds of earthworms. And the jumping earthworms that leave trails of dirt that looks like...