animal

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Across
  1. 3. a bird, can send letters
  2. 5. live in water, has hard shell
  3. 7. a bird, can't fly, black and white
  4. 8. live in water, has a big mouth
Down
  1. 1. the biggest mammal in the sea
  2. 2. live in the desert, can carry heavy things
  3. 4. the biggest bird, can't fly
  4. 6. has the most beautiful tail