Scientists have observed a new parasitic behavior between a wasp and a social species of spider, where the spider re-learned an ancestral behavior! Hosted by: Hank Green Thumbnail credit: Fernandez-Fournier et al. SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org/ ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Chris Peters, Matt Curls, Kevin Bealer, Jeffrey Mckishen, Jacob, Christopher R Boucher, Nazara, charles george, Christoph Schwanke, Ash, Silas Emrys, KatieMarie Magnone, Eric Jensen, Adam Brainard, Piya Shedden, Alex Hackman, James Knight, GrowingViolet, Drew Hart, Sam Lutfi, Alisa Sherbow, Jason A Saslow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com/ Instagram: http://instagram.com/thescishow ---------- Sources: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5938628/ https://onlinelibrary.wiley.com/doi/full/10.1111/icad.12307?saml_referrer https://onlinelibrary.wiley.com/doi/full/10.1111/een.12698?saml_referrer https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1439-0310.1982.tb01089.x https://www.smithsonianmag.com/smart-news/wasp-turns-social-spiders-zombies-build-their-cocoons-real-life-horror-story-180970919/ https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0171336 https://www.sciencedirect.com/science/article/pii/S0016648017300795 https://downloads.hindawi.com/journals/psyche/1993/082186.pdf https://www.scientificamerican.com/article/how-a-wasp-turns-cockroaches-into-zombies1/ https://www.sciencedaily.com/releases/2016/01/160105102326.htm Images: https://commons.wikimedia.org/wiki/File:Social_Spider_(Anelosimus_eximius)_(25302060747).jpg https://commons.wikimedia.org/wiki/File:Social_Spiders_(Anelosimus_eximius)_communal_web_..._(40140550262).jpg https://commons.wikimedia.org/wiki/File:Anelosimus_eximius_-_Flickr_-_Dick_Culbert_(1).jpg https://commons.wikimedia.org/wiki/File:Social_Spiders_(Anelosimus_eximius)_in_communal_web_..._(26250754708).jpg https://commons.wikimedia.org/wiki/File:Social_Spider_(Anelosimus_eximius)_(40140775982).jpg https://commons.wikimedia.org/wiki/File:Social_Spiders_(Anelosimus_eximius)_in_communal_web_..._(39412840974).jpg