How does the call of a Whimbrel differentiate it from a Eurasian Curlew?

Answer

The Whimbrel’s call is distinctly higher-pitched and more rapid.

For the general observer, the Whimbrel’s call is distinctly higher-pitched and more rapid than the deep, drawn-out whistle of a Eurasian Curlew.

How does the call of a Whimbrel differentiate it from a Eurasian Curlew?
speciesbirddifferenceavianwhimbrel