Well I noticed something about the New Holland Honeyeaters the other day - the white stripes on their head. I mean normally that's what they are - 'stripes' as seen in the first photo. However, in the second photo you'll notice the stripes are actually like tufts which it can raise up when excited. Maybe you have all seen this before but it's certainly a new one for me :-) If your eyes are like mine you'd be best to enlarge at least the second image to see what I mean.
(Click on images to enlarge)