How many letters does the top answer for “the duck mole. see under duck.” have?

The most common answer is platypus (8 letters).

Crossword clue: the duck mole. see under duck.

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

platypus 8 letters web-def

small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only spec

see duck mole, under duck. 100% similar → mullingong, ornithorhynchus

see duck mole, under duck, n. 75% similar → duckbill

the buffel duck. see buffel duck. 50% similar → bufflehead