In the daytime, hot air rises as the sun heats the ground. The rising column of air is called a thermal, and it’s the perfect way for a Turkey Vulture to hitch a ride. Like an elevator to the skies, the thermal gently wafts the vultures upward. They move in a slowly ascending spiral around the thermal, rarely flapping and instead coasting on the breeze. When many vultures ride the same thermal, it’s called a kettle.

More info and transcript at BirdNote.org. 

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