How many letters does the top answer for “large long-necked wading bird of marshes and plains in many parts of the world” have?

The most common answer is crane (5 letters).

Crossword clue: large long-necked wading bird of marshes and plains in many parts of the world

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

crane 5 letters wn-def

stretch (the neck) so as to see better