Related Clues:

• Ermine, in summer
• "Ring of Bright Water" creature
• Lupine : wolf :: lutrine : ___
• Shiny fur
• Swimming mammal
• Weasel's cousin
• Playful river creature
• Playful aquatic mammal
• Animal
• Large weasel
• Mink's cousin
• Musk secreter
• Frisky swimmer
• Aquatic critter
• Pip or Pop, on 'Bear in the Big Blue House'