What would cause a ground-dwelling race to evolve for flight?

Currently coming up with a race that lives on floating islands. They are a still primarily stuck to the ground and I intend for them to be able to fly. Or else they are really gonna be stuck on those islands forever.

However, I can't come up with a good reason for them to need nor evolve to fly. They are essentially entirely self-sufficiently surviving off the ecology of the island so they have no pressing need to get off of it nor are they in peril from predators that might wish to make a snack off them. Other than some godly intervention[Forcibly making them grow wings], I have been baffled for some time now.

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What would cause a ground-dwelling race to evolve for flight?

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