Well think rabbit and deer. They are both like worms sort of made to be eaten. Their prolificness is what keeps them all going as such a large number are harvested.

Rabbits were put on Earth by the nursery industry to eat my wife's tender plants that she buys to plant in her garden that is extremely proficient only in producing fat, happy rabbits.

Land planarians (flatworms) are worm predators. I find them in my garden every once in a while--kinda creepy!

Ewwwww.

Depending where you live there are also terrestrial leeches that feed on worms and slugs. In fact there was a foot long leech discovered in New Jersey about 10 years ago and it turned out to be a new species.