We've seen other benefits within the garden such as the time when a large infestation of small caterpillars attacked a plant called Goat’s Beard. Once upon a time we would have sprayed with an insecticide, but instead we let nature take its course.
We watched and waited until the parents of a brood of Long Tailed Tits, which were nesting in a box that we had put up for them outside our gardeners’ bothy, found the caterpillars and spent the next 2 days flying to and fro to feed them to their young – a very satisfying outcome.