I noticed this under-constructed wasp comb two weeks ago. At that time, there was only one wasp worked. Now, there are four of them work together. They belong to social wasp becasue solitery wasp does not build nest at all. I guess they are either hornet or paper wasp in terms of the nest appearance. Normally, social wasp colony is built by wood pulp or soil, which mixed with saliva. The very first wasp is queen. It built a canopy with cell and then laid egg in each cell. That's why the number of worker increases gradually. After enough female workers are born, queen focus on reproduction. And then, workers add new tier on old one to form a big comb eventually.
Interesting, a old nest (on lamp) was abandoned without completion. I think heat from the light dry it quickly and make it unsuitable to live.
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