... good question! And I'll bet it's one we've ALL pondered from time to time after chasing wildly around a room flailing a rolled~up newspaper in a futile attempt to kill one or more of those pesky critters.
Well ...... I've just discovered this link for you to "swot up" if you're looking for reasons WHY.
www.bbc.co.uk/news/science-environment-41284065![]()