This is one story of man's introduction of a species to a new environment that has turned out well. Most don't.
Invasive species (not native to the region) are usually bought accidentally on cargo ships.
But sometimes are imported deliberately to eradicate a plague caused by another species. It doesn't always turn out well.
In Australia native beetles were destroying the sugar cane crop so cane toads were imported into Australia to eat the beatles. Now Australia has an infestation of non-native cane toads. Probably Muslim cane toads