Everglades National Park

Everglades National Park

Fla. Scientists Hunt Predatory Pythons That Pose Threat to Everglades Food Chain

The snake hunter shakes his head as he crouches over a sandy trail that pushes through Collier-Seminole State Park.

Hoping to spy subtle signs of his slithering prey, Paul Andreadis instead finds only pebble-sized pockmarks left by raindrops overnight and maybe tracks left by a deer, probably that morning.