It's a peaceful haven during daylight, but at night the local fox(es) would make short work of them. She'd be a sitting duck.
As a footnote, our neighbour from over the road rang our doorbell last May or June and said "I've just seen a duck walk down the side of your house and under the back gate, with six or seven little ducklings following her!" He was astonished when I blithely replied, that she'd been a frequent visitor, along with her mate, and had obviously made a mental note of the location. Privately, I was just as astonished; she'd only flown in previously, but had just walked dog knows how far along busy footpaths and possibly across several roads from wherever she'd nested, with her trusting brood following her, back to her safe space. They only stayed a couple of hours before moving on.