The great journey

Animals are constantly on the move to ensure the survival of their species, from the spontaneous wildebeest migration in East Africa to the southward flight of geese from Minnesota. Scientists are now learning more than they ever knew about how and why animals migrate, and how obstacles to migration could impact different species.

Guests

• Rory Wilson: Head of the Institute for Environmental Sustainability at Swansea University in Wales, and scientific consultant on the National Geographic Channel's "Great Migrations" series.
• Scott Weidensaul: Author and naturalist. He is author of several books, including "Of a Feather" and "Living on the Wind: Across the Hemisphere with Migratory Birds."

Resources

• National Geographic's Great Migration series
• About Rory Wilson
• About Scott Weidensaul