Narwhal on a Sunny Night

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Across
  1. 2. The only whales that have one spiraled tusk
  2. 5. Special filters in whales' mouths that catch food
  3. 7. The world's largest island
  4. 9. Massive chunks of ice broken from glaciers
  5. 10. A mythical horse with a horn on the forehead
  6. 11. A long pointed tooth
Down
  1. 1. The location of objects by hearing reflected sound
  2. 3. Layers of fat trapping heat to keep animals warm
  3. 4. Baby whales
  4. 6. Sailors and explorers from northern Europe
  5. 8. An icy region at the northern tip of the world
  6. 9. A group of people from Greenland, Canada, & Alaska