Any animals

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Across
  1. 1. i need lots of exercise
  2. 3. i have a horn but i am not a unicorn
  3. 5. gilled animal
  4. 6. i give you mice in the middle of the night
Down
  1. 1. i live in the sea but i am not a fish
  2. 2. i burrow holes in the ground
  3. 4. i have a tail full of colors