While on a mission to explore the creature powers of the chickadee - and to discover why such a little bird can make it through the toughest winters - Martin and Chris get separated. While Chris makes it back to the Tortuga with his chickadee findings, Martin encounters an ermine. With the help of this little weasel, Martin also learns what it takes to survive in this harsh environment. Science Concept: Animals use different strategies to survive in harsh environments.