Grizzly! (Part 1)

Subject: case study of the Grizzly bear. Two scientist brothers roam Yellowstone Park armed with drug-filled darts. Using electronic devices. They follow the bears to winter dens. Working with drugged bears, they risk their lives to find out how the beasts live and to check weight, pulse, blood chemistry, and other vital information that might have scientific and medical application.
Shots: 60s wilderness shots, grizzly bear; habitats in North America; use of electrical equipment