What is the primary vocalization mentioned for general communication by the American Kestrel?

Answer

A high-pitched, repeated killy-killy-killy call

The primary vocalization used during breeding times and for general communication is described as a high-pitched, repeated killy-killy-killy call.

What is the primary vocalization mentioned for general communication by the American Kestrel?
speciesbirdraptorwildlifekestrel