Steller's Jay gives a loud and repeated harsh call during aggressive mobbing of predator at 0:07 in Del Monte Forest, CA.

“They also make a variety of guttural sounds and a harsh, nasal sounding growl. Sometimes they mimics birds, mammals, and other sounds in their environment. Researchers have heard them imitating squirrels, Northern Flickers, Northern Goshawks, White-breasted Nuthatches, and mechanical sounds such as water sprinklers.”
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“One of the most vocal species of mountainous forests, Steller’s Jays keep up a running commentary on events and often instigate mobbing of predators and other possibly dangerous intruders.”
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