How many letters does the top answer for “a group of passerine birds having the syrinx at the lower end of the trachea.” have?

The most common answer is tracheophonae (13 letters).

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Crossword clue: a group of passerine birds having the syrinx at the lower end of the trachea.

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

tracheophonae 13 letters web-def

A group of passerine birds having the syrinx at the lower end of the trachea.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)