Bottlenose Dolphins!

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Across
  1. 2. A thing with more than 2 members
  2. 4. Vibrations that can be heard
  3. 7. Violent or forceful attitude
  4. 10. Hot
  5. 12. All by themselves
  6. 14. Catching a prey or opponent
  7. 16. Activity in the water
  8. 18. Activity for enjoyment
  9. 19. Mating
  10. 20. A group working together
Down
  1. 1. Interacting with each other
  2. 3. Not human
  3. 5. Something for educating children or a lot of fishes together
  4. 6. Known or seen before
  5. 8. Area of a lot of water
  6. 9. Smart
  7. 11. Shape of the nose of a bottlenose dolphin
  8. 13. Animals that are hunted for food
  9. 15. Trying to find and catch something
  10. 17. Remembering things