How many letters does the top answer for “author of the birds of america” have?

The most common answer is audubon (7 letters).

Crossword clue: author of the birds of america

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

audubon 7 letters wd-fact-v3

United States ornithologist and artist (born in Haiti) noted for his paintings of birds of America (1785-1851)

author of the birds 67% similar → hitchcock

author of crippled america 50% similar → trump

author of democracy in america 50% similar → tocqueville

author of lost in america 50% similar → kafka

author of the blue bird 50% similar → daulnoy, maeterlinck

author of the painted bird 50% similar → kosinski

author of the thorn birds 50% similar → mccullough

wrote the birds of america 50% similar → audubon