extreme animals

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Across
  1. 2. this animal can hold his breath for one hour.
  2. 5. this dog is very tiny.
  3. 6. this animal has a heaviest tongue.
  4. 7. this animal has black and white stripes.
Down
  1. 1. this animal lives in water but can also climb trees.
  2. 3. this animal has ears on its knees.
  3. 4. this animal never closes its eyes.