Related Clues:

• Thrash
• Aquatic mammal
• Possible source of mermaid legends
• See 64-Across
• See 25-Across
• Oil source
• Moby-Dick, for one
• Endangered Florida creature
• Humpback, e.g.
• Sea cow
• Sea
• Dugong's cousin
• Member of a pod
• Aquarium attraction
• -