Jillian and Haley dive into the Timothy Treadwell documentary "Grizzly Man" before Jillian tells the story of chronobiologist Michel Siffre and the time isolation experiments. Haley talks monarch butterflies during conservation corner.

Sources: Caveman: An interview with Micchel Siffre, Joshua Foer and Michel Siffre, Cabinet Magazine

Siffre Cave Study Psychology, Study Smarter

Chronobiology, McGill

Six Months Alone in Midnight Cave, James M. Deem

Deep Time Study: French volunteers leave cave after 40 days in isolation, BBC

A test subject who spent 40 days in a cave for science breaks down what it was like, from weird sleep patterns to generating power with a bike. Marianne Guenot, Business Insider

Michael Siffre, Wikipedia

Amistad National Recreation Area

IUCN Changes Migratory Monarch Status from Endangered to Vulnerable, Monarch Joint Venture

Conservation in North America, USDA

Monarch Butterfly, National Wildlife Federation