My house (in Israel) has a concrete structure, with a decorative veneer of Jerusalem Stone at least an inch thick. Yesterday I came out to discover a little hole in the wall - and a pair of bees coming in and out of it! (See video)
This wall is no more than 5-6 years old, and I have never drilled anything there; they're not reusing a human-made hole. I must conclude that the bees somehow dug that hole.
Is that possible? What kind of bee could do this?
Update: As interesting as these bees are I didn't want them living in my wall, so I filled up the hole with a silicone-type glue. A few hours later, they had dug through that, too.