I sure hope your balcony can hold the weight of an oak tree.
Are there squirrels in your area?
I have seen them go up vertical house walls to raid a bird feeder on my neighbour's balcony on 4th floor...
Yeah, there are, but I have only ever seen them on and between trees, never on houses. Would be nice to have them visit during the day, when my shutters are rolled up so I can admire them.
The hole is also very small and I had blackbirds dig in the pot next to it before, so I also suspect birds. Crows are known to leave gifts and acorns are among the possible choices.
If it was a squirrel, it may come back and search it in a few months.
Wildlife cam!
Blue Jays and Sparrows will also do this and usually only at dusk or dawn.
No they didn't.
You see nothing.
Mildly Interesting
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This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.