In which John Green (re-)introduces nerdfighteria to giraffe sex, long a staple of the vlogbrothers channel, and explores why giraffe mating habits are so problematic in the current world. Other topics include biodiversity, baby giraffe birth, the Columbian exchange, etc. But it's mostly about giraffe love. Footage from: Baby Giraffe First Time Standing: https://www.youtube.com/watch?v=ls2jv6gAeuk Giraffe Birth at Memphis Zoo: https://www.youtube.com/watch?v=1kZW8e79Bm0 Mating Giraffes "Sexual Education" On The Sixth Try: https://www.youtube.com/watch?v=9jGK-ahxRh8 The statistic about the biomass of humans, livestock, and large non-domesticated animals comes from the book Sapiens by Yuval Harari: https://www.amazon.com/Sapiens-Humankind-Yuval-Noah-Harari/dp/0062316095 ---- Subscribe to our newsletter! http://nerdfighteria.com/newsletter/ And join the community at http://nerdfighteria.com/ http://effyeahnerdfighters.com/ Help transcribe videos - http://nerdfighteria.info/ John's twitter - http://twitter.com/johngreen John's tumblr - http://fishingboatproceeds.tumblr.com/ Hank's twitter - http://twitter.com/hankgreen Hank's tumblr - http://edwardspoonhands.tumblr.com/