Identificaciones de kneubaue

Looks like a bee, particularly head shape and mandibles, though I could be wrong. Flight is what I'd call "fly-like" rather than "bee-like" for whatever that's worth--as it approaches this wood slab table, it makes left-to-right movements of several inches at a time while progressing forward very slowly. It is fond of this table, and seems to be looking for something in particular when approaching it. The table has preexisting hollow cavities in it. These photos are taken of the insect in a cavity, but I don't know if the insect created this one. It looks to have sizeable mandibles relative to the size of its head. It looked like it was pulling something light in color out of the cavity using those mandibles--maybe wood?--but hard to see. It's under an inch in length.