Your surprise is in here! (What is the common theme?)

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Across
  1. 2. I carry a joey in my pouch
  2. 3. The _____ hunter
  3. 5. Opera house
  4. 6. I have short legs. I am pudgy. I have a stubby tail.
Down
  1. 1. I like to hug trees
  2. 2. Danny loves this person
  3. 3. You want your surprise? Check the _______ box you gave me.
  4. 4. You can see me from space (acronym)