Any of an Order of Sea Mammals With Flippers

This page is the CodyCross answer for the clue below from Resorts, Group 554, Puzzle 3 (Rock Climbing).

Question is: Any of an Order of Sea Mammals With Flippers

and the answer is: CETACEAN

Word Meaning:

CETACEAN — Pertaining to the zoologic infraorder Cetacea, or associated with species falling under that taxonomic hierarchy.

Definitions from Wiktionary.