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WHY DO LADYBIRDS SWARM?

Known as cluster-hibernators, ladybugs swarm because they're looking for a warm place to hibernate for winter.

When one of them finds a suitable place to spend the winter, it releases a pheromone that attracts a couple gazillion more of them. 

In fact, the pheromone can keep the ladybugs coming back year after year. 

Ladybugs simply find loose-fitting screens, cracks, and vents, and soon enough, they're house guests. 

It’s a phenomenon that causes a great deal of exasperation.

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