The Amazonian Boto Is a Rare River-Dwelling One
Puzzle 2 of Vienna Hard Pack
Question is: The Amazonian Boto Is a Rare River-Dwelling One
and the answer is: DOLPHIN
Word Meaning:
DOLPHIN — A carnivorous cetacean with a beak-like snout, famed for their intelligence and occasional willingness to approach humans.
Definitions from Wiktionary.