Table 1.

Various behaviours we recorded from the video analyses

Category	Behaviour	Description
Mirror interest	Looking at mirror	Spending time on perch in front of mirror or next to mirror while looking into mirror
Social behaviour	Submissive display	Crouching and turning black frontal markings away from mirror
	Aggressive display	Displaying black frontal markings to mirror
	Attack	Flying into mirror
Body-directed behaviour	Preening	Using the bill to preen feathers outside the mark area
	Cleaning bill	Wiping the bill against the perch
	Ruffling	Shaking the feathers to separate and fluff them
	Scratching	Scratching any part of the body except for the mark with a foot
	Body grooming
Mark-directed behaviour	Mark grooming	Using the bill to preen feathers at the mark
	Mark scratching	Scratching the mark area with a foot