FLORIDA EVERGLADES, Fla. — Biologists said an unusual animal death deep in the Florida Everglades led to a positive surprise. Officials said they found a 13-foot python dead, and they want to know how ...

Ian Bartoszek (right) and research partner Ian Easterling hold up a large female python located by tracking one of their male scout snakes. These male pythons are used to help locate the big females ...

"We're not seeing signs of them dying off," one of the study's lead authors told NBC News. "They are increasing in size and ...

— -- Giant Burmese pythons have already established themselves across thousands of square miles of Florida's Everglades, where outdoor workers now routinely find them. The state had held out hope ...