Crossword Genius

Massive river-dwelling mammal (5)

Ross

I believe the answer is:

hippo

(Other definitions for hippo that I've seen before include "Massive thick-skinned animal of African rivers" , "Thick-skinned type" , "African wallower (abbr)" , "large African creature" , "Large wallower (abbr)" .)

I've seen this clue in the Sydney Morning Herald.
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