The growth history of Hogwarts poisonous magizoologist

Synopsis: "Dakuwaja lives in warm oceans, while Thelma Lake Monster lives in icy freshwater lakes. The former is a shape-shifting creature that can transform from fish to human, and the latter is a serpent that eats human and fish flesh ...keep them crowded in lukewarm, half-salt water, and unless you have the brains of a Billywig worm, you won't be able to predict that Dakuvaja will be slaughtered instantly." - Roff Ska Mander talks about the accident at the opening ceremony of the 2014 Quidditch World Cup Book Club: 597340339