Missing Hormone - Leptin Found in Birds

How can the Arctic tern, a sea bird, fly more than 128,000 km in its round-trip from north pole to south pole? Or how does the emperor penguin incubate eggs for months during the Antarctic winter without eating? These physiological gymnastics would usually be influenced by leptin, the hormone that regulates body fat storage, metabolism and appetite. However, leptin has gone missing in birds - until now. Researchers from Ohio-based ...