Where do stories of unicorns, mermaids and Bigfoot come from? And do they have any truth to them? In this four-part series, we're tackling listeners' biggest questions about modern myths and legends.

Today's episode is about mythical creatures that live on land. We'll hear the story of El Chupacabras, learn about the search for Bigfoot, and hear from some animals once mistaken for unicorns. Marc and Sanden have a new project to share, and Gungador has an urgent announcement. Plus, a Moment of Um about how sloths snooze upside down.

If you want to learn more about the history, facts and lore behind dragons and unicorns, check out this fascinating episode of Smash Boom Best: UNICORNS VS DRAGONS!

This episode is sponsored by Pillsbury Crescent Rolls, iD Tech (idtech.com/brains), and KiwiCo (kiwico.com/brains). You can support Brains On at brainson.org/donate. All supporters of the show will get a bonus mystery sound extravaganza episode this January!