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Black with 6 yellow patches on abdomen.
http://en.wikipedia.org/wiki/
Possibly a wasp nest attached to a ranch of a tree.
Observed eating wood (?), leaving little ridges like the one in these photos.
Seemed fairly inactive. One insect flew in as I inspected it.
Belongs to genus yellowjackets though called a hornet.
Large wasp or bee that was repeatedly grinding down bits of wood n our deck