Enter a clue or pattern or both:
The Clue
Boston Celtic fans' favorite pastime? (12 letter answer)
The Answer
BIRDWATCHING
Tags
Notes
The answer BIRDWATCHING is so rare that it appears less than once every 2500 puzzles.
Definition
BIRDWATCH as a verb:
1. (bird, birdwatch) = watch and study birds in their natural habitat