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Yesterday night/morning an animal buried this acorn in my 5th floor balcony flower pot
(sh.itjust.works)
Photo of flower pot with red houseleek and some grass coming out between the remnants of the Edelweiss that died a few months ago and a fresh hole with a single acorn in it.
Thanks for the info. We don't get blue jays here in EU, but lots of sparrows and the eurasian jay known locally as the Eichelhäher (Acorn Jay). The acorn seems too big for regular sparrows beaks, but not sure. If it's an eurasian jay I probably won't see them, because they are very shy here. I only ever saw them from very far, hiding on trees when I heard their warning signal.
Yes, other species of Jays would also be capable of doing this.
Thinking about it more, the EU has another more probable species: Woodpeckers.
When I lived in Spain, there were half a dozen woodpeckers who would eat acorns. I have zero doubt that a woodpecker would do this.