Joe Duff, CEO of Operation Migration, is not the only conservationist to wear a uniform to work. But instead of the khakis and polos that serve to show that humans are all part of the same team, his uniform helps him blend in among a flock of whooping cranes. It’s not a bird costume, per se. Rather than making the wearer look like something else, its purpose is to conceal what they are — a human being who’s trying to teach these cranes how to be wild.