When tiny holes appear on a tree, they often tell a story. These could either be due to harmless nesting activity of some animals, or they could be insect infestations that threaten a tree's survival.
The fat bees are back, as are the tiny holes they love to drill in decks and porches. Carpenter bees (not to be confused with bumblebees or honeybees) are large bees with shiny, black tail sections.