What vocalization is characteristic of the male Wood Duck?

Answer

A thin, raspy whistle that often rises in pitch

Wood Ducks do not produce the classic 'quack'; the male uses a thin, raspy whistle, while the female uses a loud, short squeak or a sharper 'cr-r-ek, cr-e-ek' alarm call.

What vocalization is characteristic of the male Wood Duck?
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