Zozu, like any other white stork in Europe, typically flies to southern Africa for the winter. Yet when researchers at Germany’s Max Plank Institute for Ornithology tracked the bird’s path using a GPS logger in 2016, they found that he and a few others had skipped the grueling migration across the Sahara Desert. That year, the birds stopped, instead, in cities like Madrid, Spain, and Rabat, Morocco. Apparently, they had developed a taste for junk food, in particular the stuff that piles up in la…