The monarch butterfly is widely recognized and widely dispersed across North America and it's in trouble. Federal officials ...

"You challenged me in ways no one else could," Roger Federer tells Rafael Nadal, who will retire after this week's Davis Cup ...

About 11 million Americans are related to an immigrant without legal status in the U.S. As President-elect Trump ramps up ...

From nest-hopping to manipulating eggs, the bird world is full of family drama. Biologist Carin Bondar explains the wild side ...

Ukraine has fired six ATACMS into Russia, the Russian Defense Ministry said. If confirmed, it would mark the first attack ...