Collective noun

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Across
  1. 3. of kangaroos
  2. 6. of soldiers
  3. 7. of sailors
  4. 8. of whale/fish
  5. 9. of tigers
  6. 10. of snakes
  7. 11. of owls
  8. 13. of ants
Down
  1. 1. of stones
  2. 2. of stars
  3. 3. of giraffes
  4. 4. of rooms/furniture
  5. 5. of chickens
  6. 7. of bushes
  7. 8. of bears
  8. 12. of islands