Which wasp made this nest? I know that most of the time, there is no need to worry. But I want to make sure what this is, and how aggressive they can be. It's right next to the shed, which only gets visited a couple times a week. I cut the grass there, but otherwise, not much human activity. Would you just leave it alone, or get rid of it somehow?

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Here's a larger view to see the placement of the hive in the tree (center of pic):

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