Do you know why blue-footed boobies have blue feet? Author Laura Erickson does, and you’ll find the answers to this and many other great questions in her book, The Bird Watching Answer Book. (For the ...

That's the way one scientist puts it — referring to how infected wild birds survive long enough to spread it to birds and mammals around the world. And that's a serious risk for human health.

"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 Erik Karlsson, head of the Virology Unit at the Institut ...