Hammerhead worms are an invasive flatworm from Asia that has been spreading throughout the D.C. area over the last 15 years. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

Follow us:
Twitter: https://twitter.com/washingtonpost
Instagram: https://www.instagram.com/washingtonpost/
Facebook: https://www.facebook.com/washingtonpost/