Every cuckoo is an adopted child—raised by foster parents, into whose nest the cuckoo mother smuggled her egg. The cuckoo mother is aided in this subterfuge by her resemblance to a bird of prey. There ...

A genetic analysis sheds light on when the outbreak began, how the virus spread and where it may be going. By Apoorva Mandavilli and Emily Anthes See more of our coverage in your search ...

Add Yahoo as a preferred source to see more of our stories on Google. vet testing swabbing swan bird flu avian Christoph Reichwein/picture alliance via Getty Images In the lab, the authors of the ...

Avian influenza viruses typically require several mutations to adapt and spread among humans, but what happens when just one change can increase the risk of becoming a pandemic virus? A study led by ...