Safari Animals

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Across
  1. 3. a large pachyderm
  2. 4. which one's which?
  3. 5. their roar can be heard from 5 miles away
  4. 8. it is a very tall animal
  5. 9. chubby unicorn
  6. 10. hungry, hungry,...
Down
  1. 1. chirps like a bird, but isn't
  2. 2. immune to rattlesnakes (two words)
  3. 6. fastest running bird
  4. 7. they think everything is funny