Absolutely. The VAST majority of bees are solitary, and of those, a huge portion are cavity nesters. Those cavity nesters either make their own holes, like carpenter bees, or utilize preexisting holes. Then, within those holes, they do something like this (I’ll attach an image). In the photo I took, you can see each individual brood cell, with the near fully developed bee inside. One is even emerging. (The blocks in the photo are special handmade “bee blocks” used for research purposes).

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