Here’s a sim­ple ques­tion: When an ani­mal dis­ap­pears in the win­ter, where does it go? Odd­ly enough, this ques­tion com­plete­ly stumped Euro­pean sci­en­tists for thou­sands of years. And even today, the more we learn about the com­ings and goings of the ani­mals, the deep­er the mys­tery seems to get. We vis­it a Bavar­i­an farm with an 11 year old, fol­low war­blers and wilde­beests around the world, and get a total­ly new kind of view of the puls­ing flow of ani­mals across the globe.