This video was originally posted to TikTok in August 2021. Hosted by: Niba Audrey Nirmal (she/her) Alex Billow: Writer Kyle Nackers: Fact Checker Bonnie Meyer: Script Editor Savannah Geary: Editor, Producer Nicole Sweeney: Executive Producer Hank Green: Executive Producer Sources: https://www.pnas.org/content/115/41/10209 https://www.sciencemag.org/news/2018/10/bird-voice-box-one-kind-animal-kingdom https://www.britannica.com/science/syrinx-bird-anatomy Image Sources: https://www.istockphoto.com/photo/turkey-vulture-gm91047801-2823697 https://commons.wikimedia.org/wiki/File:Tracheae_and_Bronchial_tubes_of_male_and_female_Shoveler_ducks_from_Yarrell_History_of_British_Birds_1843.jpg https://commons.wikimedia.org/wiki/File:BirdSyrinx_DolphinNasalComplex.jpg