A ladybug invasion? It can happen.
At certain times of the year, these little red and black bugs will gather in gigantic groups. I don’t think they’re trying to keep warm, but there must be something comforting about it for them. Maybe it’s the only time they really feel safe, being as small as they are.
I witnessed one of these swarms when I lived in California many years ago. We were in a canyon just outside Los Gatos, and noticed large numbers of them gathering on the rocky walls. They were also flying all over the place, landing on our windshield and climbing up tree trunks. The neighbors took it in stride. After all, who can argue with having thousands of the best natural pet control machines in your back yard? One thing about lady bugs in such large numbers- you can smell them!