Animals in danger

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Across
  1. 3. a man who kill animals
  2. 5. one of the biggest land animals in the world
  3. 6. something that weighs a lot
Down
  1. 1. the fastest animal in the world
  2. 2. tigers have these on their body
  3. 3. rhinos have this on their head
  4. 4. murder somebody