Get to know the 
that looks like a topographical map of Mars: the Arapaima. Wait, there's more! Their swim bladder has lung-like tissue, and they excrete a milk-like substance from their head. 
On this week's episode of Fish of the Week! (our award-winning #podcast), ichthyologist Dr. Lesley de Souza takes us to the Amazon and Essequibo basins in South America to explore the habits of this fantastic fish. Catch new episodes every Monday! https://www.fws.gov/fish-of-the-week-podcast (or wherever you get your podcasts). 
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