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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond
Starting out from Brooklyn, an amateur naturalist explores our world. "The place to observe nature is where you are."—John Burroughs
This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
It would be interesting to see what the internal structure looks like. The many tunnels and chambers, all done with a purpose in mind, would be fascinating. The differences between designs of separate species would, too.
There are levels of horizontal comb inside, the number of levels depending on how big/old the nest gets. Can just see some of the capped-off comb in the Aerial nest. Here’s what one level looks like: https://matthewwills.com/2014/12/01/paper/
So the comb forms a vertical wall and the entrance to the nest is on the side? Is another wall built in front of the first once it is all sealed up?
I admire the nests, but I do not like the occupants!