Ugly bugs

This is a look at the ugly and nasty side of nature. Looks at some grim families of bugs, discover which bugs hide behind the wallpaper, what slugs do with their slime, why flies throw up in tea, and how insects drink human blood. In the second title, find out which is the nastiest animal in the world; why vultures have bald heads; what kind of frog lives in the toilet; and how vampire bats suck blood and other fascinating facts.