Resumen:
Flies. Flies are amazing acrobats - they can walk upside-down on a ceiling! With their enormous eyes, sensitive antennae, and long proboscis, they locate and suck up as much food as possible. Flies also spread germs; each fly can carry over a million bacteria. From houseflies to tsetse flies, these tiny insects are food for insectivores as well as a nuisance and health hazard to humans.