How many letters does the top answer for “watch and study birds in their natural habitat” have?

The most common answer is birdwatch (9 letters).

Crossword clue: watch and study birds in their natural habitat

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

birdwatch 9 letters wn-def

watch and study birds in their natural habitat