mathematics and animals

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Across
  1. 1. square root of 4
  2. 3. fastest animal in the world
  3. 5. king of the jungle
  4. 6. whole number
  5. 9. pink and has long legs
Down
  1. 1. prime number
  2. 2. triangular number
  3. 4. even number
  4. 7. lays big eggs
  5. 8. mans best friend