Two male northern flickers engage in a display called a "wicka bout" (aka fencing dual). They face each other, bills raised, then bob their heads repeatedly while making their "wicka" calls. Here is a link to a description and video. I think these two were pissed off that the other bird was in their tree.

Another addition to the hammock blind seres ;-)

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Make:	SONY
Model:	ILCE-7RM4
Exposure:	0.006 sec (1/160)
Aperture:	f/9.0
ISO Speed:	1600
Focal Length:	441 mm
Lens:	FE 200-600mm F5.6-6.3 G OSS