Hi Celeste
I haven’t any experience of them myself, but have read that hogs can get stuck in them. Just looked this up: https://hamworthyhedgehogrescue.org.uk/2021/04/13/ground-feeder-bird-cage-warning/
Bearing in mind that unwell (and possibly very hungry) hogs can be out during the day, I would suggest you might need to put a brick under each corner during the day as well. Some birds might find their way under (starlings come to mind) but maybe not the larger ones. Although corvids are quite intelligent.
I have some blackbirds in my garden who let me know when they want some food if they see me, so I usually stay nearby and supervise until they have had a share – the other birds seem more timid. But you could try putting out the food at more random times – so that the larger birds aren’t watching out for it.
Good luck.
