Guess the word!

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Across
  1. 1. Plural of 'foot'
  2. 4. Plural of 'sheep'
  3. 7. The heaviest sea creature
  4. 8. Animal that gives humans milk
  5. 9. The strongest animal
  6. 10. One of the slowest animals
  7. 11. Animal's hair
Down
  1. 2. Plural of 'tooth'
  2. 3. Insect with beautiful colours which can fly
  3. 4. Animal that we can confuse with an insect, but it's not!
  4. 5. Plural of 'mouse'
  5. 6. Animal with black and white stripes
  6. 7. Birds use them to fly
  7. 9. Animal that makes honey