A new study reveals that bioacoustics is an underutilized wildlife study tool on one of the world's most biodiverse continents: Africa. On this episode we discuss this gap by highlighting two new bioacoustics studies of hippos and African manatees - and we of course play recordings of their squeals, squeaks and 'wheeze honks' which can now aid their conservation. Dr. Nicolas Mathevon joins the show to share the results of a study which showed that vocal recognition is used by hippos, and we welcome Clinton Factheu, a PhD student in Cameroon who recently co-authored a study revealing the first recorded African manatee vocalizations.  Episode artwork: A hippo in the Chobe River, Botswana, by Joachim Huber via Wikimedia Commons. Please invite your friends to subscribe to the Mongabay Newscast wherever they get podcasts, or download our free app in the Apple App Store or in the Google Store to get access to our latest episodes at your fingertips. If you enjoy the Newscast, please visit www.patreon.com/mongabay to pledge a dollar or more to keep the show growing, Mongabay is a nonprofit media outlet and all support helps! See all our latest news from nature's frontline at Mongabay's homepage: news.mongabay.com or find us on Facebook, Twitter, and Instagram by searching for @mongabay. Please share your thoughts and ideas! submissions@mongabay.com.