Steller's Jays (Cyanocitta stelleri) are common residents of coniferous forests in the Western US. This one announces his presence in a Douglas Fir near Rosario, in the San Juan Islands of Washington State.
Steller's Jays are famous for mimicry, especially of raptors. This example shows some of their parrot-like chatter and calling - easy to see how they might slip into mimicry!