How many letters does the top answer for “any of several crested old world birds with a slender downward-curved bill” have?

The most common answer is hoopoe (6 letters).

Crossword clue: any of several crested old world birds with a slender downward-curved bill

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

hoopoe 6 letters wn-def

any of several crested Old World birds with a slender downward-curved bill

hoopoo 6 letters wn-def

any of several crested Old World birds with a slender downward-curved bill