We opine on the 10 worst creatures (species, not including individual human mass murderers of the past). What is a lamprey and is it the inspiration for the sandworm in Dune? Why are bats so ugly? What is an assassin bug? How many people do mosquitoes kill every year? Are crocodiles actually dinosaurs? What are Tsetse flies and how do they kill? Where and what variety of snake and spider are the worst and why? Listen to the definitive list.