How do bats wee hanging upside down?

We join a group of bats as they take off on their migration. But, the trip for these little guys won’t be easy. They’ll have to dodge man-made killers, governments who want them wiped out – not to mention the incredible task of surviving the many hundreds of kilometers they’ll have to fly. Plus, find out how bats wee while hanging upside down! Join Jessie Wingard on a night out with the bats.