I've been hanging these fat balls for a good while and they're intact. Previously I was hanging a feeder filled with seeds (for birds) in front of the window and that was also intact for a while; so I replaced it with these fat balls.
In my previous places of residence that I hung these (not exactly the same spot, but same country, similar areas), they’d barely survive a week. The ravens would destroy them if no other bird.
Here, I hear and see the birds of many species around, chirping on the tree or wandering about (and snacking) on the ground or flying but they don’t seem to eat anything from these feeders. I’ve also thrown a few pieces of bread on the ground/bushes, and the same thing happens. It remains intact for days till I remove them. What could be wrong?
Across the fence in the background it's a sports field with natural grass. During spring I'd see herds of wild fowl grazing there, possibly before starting their migration journey. At nights I see foxes marching around and I’ve also spotted a squirrel once if that matters.
The Irish sea is only a few kilometers away, and that's where the wild fowl would visit from. The area outside the flat is regularly maintained by whomever is in charge, but as far as I am aware there aren't any bird repellants used. There shouldn't be any chemicals either, and even if there is, that should be washed by the frequent rain fall that happens here. The balls are generic bird fat balls but not super new; the mixed seeds were just purchased and were/are very fresh. The feeder is a standard one, made of metal caging and a plastic lid. The metal is obviously painted for rust protection but there's nothing unusual about it, no paint smell or anything like that. Plus the fact that I have used the very same item in other places to feed birds and they've been happily eating from it.
P. S. The photo is taken from inside. One ball is hanging on the tree and the other is hanging outside the window, off the above neighbor’s balcony construction. This window is west-facing with little sun or heat other than the afternoons or sunsets, clouds-permitting!