On Friday I heard a commotion at my office window. There was a bird flapping persistently against the corner of the window. On closer inspection, we found a swarm of ladybugs at a crack in the wall, and the bird had stationed itself there for its own private buffet.
A lot of folks in the Boston area noticed ladybugs swarming after last week’s early snow and cold weather. This is normal, as ladybugs look for winter shelter as the weather cools. Large, light-colored objects (like the sunny south side of a building) attract them, and they make their way in through cracks, vents, and gaps around windows and doors.
Ladybug incursions don’t pose any threat — they do not breed or eat over the winter — but they can be a nuisance. Prevent entry by putting mesh over vents, sealing cracks, and weatherstripping. Maybe you’ll enjoy a decrease in home heating costs, too! Once inside, you can also vacuum up the bugs, but be warned that they can release a staining, foul-smelling liquid when threatened.
For detailed info, including how to catch and release the insects inspring, see this Fact Sheet.