Leave It to This Semi-Aquatic Dam Builder
Puzzle 15 of Teamwork Pack
Question is: Leave It to This Semi-Aquatic Dam Builder
and the answer is: BEAVER
Word Meaning:
BEAVER — (countable) A semiaquatic rodent of the genus Castor, having a wide, flat tail and webbed feet, native to the Northern Hemisphere.
Definitions from Wiktionary.