Animals' body parts

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Across
  1. 4. What lets a monkey swing from trees like a tail?
  2. 6. What helps a bird fly and keeps it warm under its feathers?
Down
  1. 1. What does a deer have on its head that can show its age and health?
  2. 2. What are the sharp nails that cats can hide?
  3. 3. What helps a chameleon see its prey by moving independently?
  4. 5. What do dolphins use to talk and find their way underwater?