ur sound

1234567
Across
  1. 3. Bert likes to do this in the air
  2. 4. A place Bert flies over
  3. 6. A sudden feeling Fern
  4. 7. A tree Bert flies around
Down
  1. 1. name with /ur/ spelling
  2. 2. The sound Bert makes
  3. 5. A small animal that can purr )
  4. 6. Fern’s curious little pet