Related Clues:

• Seattle bus pass with a finned logo
• River horse (abbr)
• The limits to action hero overdoing it as a dangerous swimmer
• Mud-loving animal
• Black-and-white animal hidden in "colorcast"
• "Free Willy" whale type
• Somewhat major carnivore
• Whale that preys on octopuses
• Fierce monster or moggie with tail docked
• Vancouver Canucks' mascot Fin, for one
• Penguin-hunting swimmer
• 'Blackfish' whale
• Sea creature some sailor caught
• Killer in Windsor Castle
• Doomed boat in "Jaws"