Which insects live in your house?

The flies, mosquitoes, and ants you sometimes see, of course. But also many insects that keep out of sight. The holes in your wool sweater were probably made by moth caterpillars or beetle larvae. Your dog scratches to get rid of tiny fleas. Hidden in your bookcase may be “bookworms,” which are beetle larvae. And those fuzzy creatures you can find inside bad apples are the caterpillars of certain moths.