We know of some great animal journeys.We can watch them on TV. So many weird and wonderful animals pass through so many strange places on Earth. Salmon migrate by leaping upriver; crabs scuttle over the ground; locusts swarm; grazing herds wander; whales go miles and miles using echolocation. But the journey that I’m going to marvel at today takes place on a much smaller scale. And that’s the journey of a parasite we know as Lungworm.