From Real Science. ( YouTube / Nebula ) To get 20% off an annual premium subscription to Brilliant, go to https://brilliant.org/realscience/ Watch this video ad-free on Nebula: https://nebula.tv/videos/realscience-these-slugs-break-the-rules-of-biology My socials: Patreon: https://www.patreon.com/realscience Instagram: https://www.instagram.com/stephaniesammann Images Courtesy of Getty Images Thanks to our Patreon Supporters: Eric Ypsilantis REFERENCES: [1] Kawaguti S Yamasu T . 1965. Electron…