The UK has been alarmed by the "New Zealand flatworm" threatening its earthworm population - some places have lost all of their worms, though it seems to be under control. On the other hand at a push, it may be possible to deliberately seed forests with them.

I think this article is quite hyperbolic though. It talks about a researchers "horror" at theoretical possibilities, but the latest literature review cited is 6 years old and it did not resolve any definite effect.

>Our results suggest that although earthworms are largely beneficial to soil fertility, they increase net soil greenhouse-gas emissions.

https://www.nature.com/articles/nclimate1692

No flame intended here, but have to state this.

Worm-eater. That's such a typical solution. The cause of this migration should be given a solution, not the effects or result of the migration.

Due to pollution and habitat encroachment, early birds are becoming endangered in many parts of the world.