In 1974, the chimpanzees at Gombe National Park in Tanzania began a series of violent attacks that stunned researchers, including Jane Goodall. Over the next four years, the Kasekela chimpanzees would decimate the Kahama group. The twist? These groups used to be one and the same. It's taken decades for researchers to understand why the chimp group split in two, let alone why they fought so brutally. And just as researchers have started to understand the complex dynamics that led to this war, another group split is beginning in Ngogo, Uganda. Thanks to Ian Gilby, Joseph T. Feldblum, Anne Pusey, Richard Wrangham, and Aaron Sandel for their help and participation in the making of this video. This video was made possible by the Alfred P. Sloan Foundation. To learn more, head to https://sloan.org/programs/public-understanding Hosted by: @LindsayNikole Instagram: https://www.instagram.com/lindsay_nikole/profilecard/?igsh=MzRlODBiNWFlZA TikTok: https://www.tiktok.com/@lindsaynikole?_t=8rB2kumfcI2&_r=1 ---------- Support us for $8/month on Patreon and keep SciShow going! https://www.patreon.com/scishow Or support us directly: https://complexly.com/support Join our SciShow email list to get the latest news and highlights: https://mailchi.mp/scishow/email ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Reed Spilmann, Odditeas , Garrett Galloway, Friso, DrakoEsper , Kenny Wilson, Lyndsay Brown, Jeremy Mattern, Jaap Westera, Rizwan Kassim, Harrison Mills, Jeffrey Mckishen, Matt Curls, Eric Jensen, Chris Mackey, Adam Brainard, Ash, Piya Shedden, charles george, Alex Hackman, Kevin Knupp, Chris Peters, Kevin Bealer, Jason A Saslow ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/ TikTok: https://www.tiktok.com/@scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow Facebook: http://www.facebook.com/scishow #SciShow #science #education #learning #complexly ---------- Sources: https://docs.google.com/document/d/e/2PACX-1vTomYKi7lmP58gvoxN7Pvli5cb4JbO5HA0kFS5rTx84YPVn_CNu28Im8zlQrLim14EtJ2eDUFp6tvVS/pub