A fungus that has killed millions of bats across North America has arrived in Arizona, state wildlife officials announced on Thursday.

With threats of avian flu and lead poisoning, biologists are working overtime to care for a species that nearly went extinct.

Jaguars once roamed the American Southwest, but their presence faded over the years. Now, new sightings in Arizona suggest these big cats may be returning to their historic range. Could jaguars truly ...

Each spring, pregnant Mexican long-nosed bats fly north from Mexico to parts of southern Texas and New Mexico, feasting on nectar from saguaro, cardon and organ pipe cacti as they migrate. Sometimes, ...