A new pandemic is killing hundreds of millions of birds, and some species may be completely lost
The flu virus can infect practically every species of mammal. It’s also capable of infecting birds. For a disease to readily infect two groups whose last common ancestor lived somewhere between 320 and 340 million years ago is pretty unusual, but far from unheard of. After all, there are good half a dozen bacterial diseases that you can get from handling a turtle. Even so, flu is extraordinary in how it has adapted to such a variety of hosts.

























