NGC herpetologist Brady Barr dons a specially designed 200-pound Kevlar suit covered in hippo dung and mud on a mission to extract sweat from a wild hippo.

NGC herpetologist Brady Barr tracks the Komodo dragon, a fierce predator with razor-sharp teeth that can consume 80 percent of its body weight in a single meal.

Highlights from some of Dr. Brady Barr's greatest adventures are featured.

Something is blinding American Crocodiles living in Costa Ricas Tarcoles River and Brady Barr is on the case. What could be causing this devastating condition? Turns out-- the Tarcoles River is one of the most polluted waterways in South America. Could deadly pollutants be the smoking gun or is something even more sinister at work?