Kakapo joke. Use the first letter of each of the words you have solved and solve the joke

123456789101112
Across
  1. 3. a cat
  2. 4. air
  3. 5. an intelligent bird
  4. 7. lion's brother
  5. 8. offsprings off frogs
  6. 11. a place where an animal lives
  7. 12. kakapos eat it
Down
  1. 1. the night bird
  2. 2. close to extinction
  3. 6. mice
  4. 9. cold-blooded vertebrates that live both on land and in water,
  5. 10. eats both meat and vegetables