Native Americans have long revered huge birds called Thunderbirds. There was a rash of giant bird sightings in Illinois, Texas and Alaska back in the 1970's. Find out more in Season 1, Episode 4, "Birdzilla."

#MonsterQuest

Subscribe for more from MonsterQuest and other great The HISTORY Channel shows:
http://histv.co/SubscribeHistoryYT

Check out exclusive The HISTORY Channel content:
History Newsletter: www.history.com/newsletter
Website - http://www.history.com
Facebook - https://www.facebook.com/History
Twitter - https://twitter.com/history

"MonsterQuest" takes a scientific look at reported sightings of cryptozoological creatures (cryptids) and paranormal entities around the world, including the Loch Ness Monster, Bigfoot, and werewolves.

The HISTORY® Channel is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network's all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.