Random seedling from tuber

in Plants
One of the things I love about this time of year all the random seedlings that pop up in various pots.
In one of my Japanese Maple pots, this very long thin root seedling with a tuber appeared. Anyone have any idea what it is?

In one of my Japanese Maple pots, this very long thin root seedling with a tuber appeared. Anyone have any idea what it is?



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But at night something climbs into the pots - even the tallest ones - and digs around.
I wonder if it was a bird?
Either way I don’t have space for an oak.
You are very fortunate not to have squirrels!
East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Our garden isn’t anywhere near big enough for an oak tree although I would love one. If I just put it in a container I’m prepared to root prune and all of that stuff… would this work? I’m not talking bonsai just a regular 20 L pot or something.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.