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I'm pretty sure it's some kind of a suet cake/fat ball, i.e. bird's food, see the first image on the Wikipedia article: https://en.m.wikipedia.org/wiki/Suet_cake (Luc Viatour / https://Lucnix.be)
Answer
I'm pretty sure it's some kind of a suet cake/fat ball, i.e. bird's food, see the first image on the Wikipedia article: https://en.m.wikipedia.org/wiki/Suet_cake (Luc Viatour / https://Lucnix.be)