Franciscana, or La Plata River, dolphins are found only in waters off the coasts of Argentina, Uruguay and Brazil. According to the International Union for Conservation of Nature's (IUCN) Red List of Threatened Species, the Franciscana population is threatened. That's because hundreds of the slender dolphins drown in fishing nets along the coast of South America every year. Conservationists have developed this so-called "banana pinger," a high-frequency transmitter that's attached to fishing nets and scares dolphins away. Subscribe to us on YouTube: https://goo.gl/lP12gA Download our APP on Apple Store (iOS): https://itunes.apple.com/us/app/cctvnews-app/id922456579?l=zh&ls=1&mt=8 Download our APP on Google Play (Android): https://play.google.com/store/apps/details?id=com.imib.cctv Follow us on: Facebook: https://www.facebook.com/ChinaGlobalTVNetwork/ Instagram: https://www.instagram.com/cgtn/?hl=zh-cn Twitter: https://twitter.com/CGTNOfficial Pinterest: https://www.pinterest.com/CGTNOfficial/ Tumblr: http://cctvnews.tumblr.com/ Weibo: http://weibo.com/cctvnewsbeijing