Some species of birds like geese save energy by flying in close formation. Airliners could use a similar trick to burn less fuel. In the early 1500s, Italian Renaissance master Leonardo da Vinci ...

That's the way one scientist puts it — referring to how infected wild birds survive long enough to spread it to birds and ...

"We've gone from this concept of dead birds don't fly to this new virus that seems to be a bit more like dead bird flying," explains ... moving from one flock to the next without burning itself ...