Episode one I am discussing the Hippopotamus!

Sources: 

https://www.researchgate.net/publication/253164153_Low-frequency_sounds_and_amphibious_communication_in_Hippopotamus_amphibious

https://www.livescience.com/102-cousins-whales-hippos.html

https://www.cbsnews.com/news/pablo-escobars-hippos-keep-multiplying-and-colombia-doesnt-know-how-to-stop-it/

https://www.hippoworlds.com/hippopotamus-aggression/

https://www.thoughtco.com/strongest-bites-in-the-animal-kingdom-4099136