Most Christians will be used to the representation of the Holy Spirit as a dove. Indeed it was a dove that descended upon Jesus when he was baptised. But the Celtic church opted for another bird: the wild goose.
The thing about wild geese is that, like the Holy Spirit, they're uncontrollable. No-one can tell them what to do. And they can be noisy, challenging and even scary.
God doesn't always appear as we might expect him to.
P.S. If I could work out how to include an MP3 track I'd put it on here.