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This is growing in my backyard. Is it a maple? It looks a little maple-y, but Google Image comparisons were inconclusive, and there aren't any maples nearby that might have dropped a seed.
This looks like maple, could be Acer pseudoplatanus. But hard to be sure at this stage. You could update with more photos when leaves are completely unfolded.
By the way, I am not sure if this is a seedling though. It could be in its second year already since I don't see any cotyledons.
Required, but never shown