Plunge dive sequence:
	(1) Listen from perch and locate prey under snow.
	(2) Fly slowly to spot above prey.
	(3) Plunge down, face- and feet-first, with clenched “fists.”
	(4) Crash through  crust with clenched feet.
	(5) Reach around under snow with long legs.  Can reach 1 1/2 feet or further.
	(6) Come up with prey held in one foot.
	(7) Fly back to perch and swallow prey.