Not all non-native species are totally terrible! Here are six of them can actually do more good than harm. Hosted by: Stefan Chin Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- 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.invasivespeciesinfo.gov/animals/bts.shtml http://www.slate.com/articles/health_and_science/green_room/2009/11/dont_sweat_the_invasion.html https://www.nytimes.com/2016/03/01/science/invasive-species.html https://news.nationalgeographic.com/news/2014/07/140724-invasive-species-conservation-biology-extinction-climate-science/ https://www.nps.gov/articles/southwestern-willow-flycatcher.htm http://www.mauritian-wildlife.org/application/index.php?tpid=30&tcid=80 https://www.popsci.com/invasive-species-help-habitat http://www.sciencemag.org/news/2013/04/hated-invasive-species-helps-restore-ecosystem https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1523-1739.2010.01646.x https://www.macalester.edu/~davis/Nature%20Essay.pdf https://academic.oup.com/jhered/article/97/2/107/2187641 http://rsbl.royalsocietypublishing.org/content/12/2/20150623 http://www.iucngisd.org/gisd/species.php?sc=1698 http://wildlife.org/wp-content/uploads/2014/05/Feral-Horse-and-Burro.pdf Images: https://commons.wikimedia.org/wiki/File:Brown_tree_snake_(Boiga_irregularis)_(8387575202).jpg http://www.thinkstockphotos.com/image/stock-photo-horses-run-gallop-in-dust/864573690 http://www.thinkstockphotos.com/image/stock-photo-flock-of-ponies-on-meadow-over-lake-planinsko/857525524 http://www.thinkstockphotos.com/image/stock-photo-horse-in-water/510489580 http://www.thinkstockphotos.com/image/stock-photo-vintage-manual-harvest-scene/98732171 https://commons.wikimedia.org/wiki/File:Tamaris3.jpg https://commons.wikimedia.org/wiki/File:Willow_Flycatcher_-_Malheur_NWR_-_Oregon_S4E0692_(19201908736).jpg https://commons.wikimedia.org/wiki/File:Flowers_of_Iran_by_qom_city_04.jpg https://commons.wikimedia.org/wiki/File:Map_of_Pennsylvania_highlighting_Centre_County.svg https://en.wikipedia.org/wiki/File:Carcinus_maenas.jpg https://en.wikipedia.org/wiki/File:Carcinus_maenas_range.png https://commons.wikimedia.org/wiki/File:Sesarma_reticulatum.png https://en.wikipedia.org/wiki/File:Spartina_alterniflora.jpg https://commons.wikimedia.org/wiki/File:Gracilaria2.JPG https://www.nobanis.org/ias-photo-bank/gracilaria-vermiculophylla/ https://en.wikipedia.org/wiki/File:Aldabrachelys_gigantea.JPG https://en.wikipedia.org/wiki/File:Tour_of_the_Galapagos.ogv https://en.wikipedia.org/wiki/File:Seychelles_outer_islands_25.08.2009_10-20-09.jpg http://www.thinkstockphotos.com/image/stock-photo-main-mauritius-island-view/530100871 http://www.thinkstockphotos.com/image/stock-photo-close-up-portrait-of-aldabra-giant-tortoise/940485024