Dr. Tim Littlewood handles more gross and terrifying creatures than just about anyone in London.
And he loves it.
"I'm a parasitologist," he explains, "so I tend to work on things that live inside other animals. And most people think of them as quite gross and revolting. But upon looking at these things and studying them, [I find] they are the most beautiful, spectacular animals you can find."
Although you wouldn't want to get one inside of you.