What is the only bird that has auricles?

But what IS an auricle?

It's amazing how quiet their flight is. A big one flew right over my head and the only thing that alerted me was the breeze it made.

The word “auricle” is never mentioned in the citation. It should be edited to include this information.

The last paragraph is the description of the owls auricle, possibly the writer exceeded the allowed space. Though technically the ruff of auricular feathers of an owl isn't a true auricle. An auricle is the visible part of an ear that protrudes from the head. The owls ruff is not 'part of the ear', just a supporting structure of feathers.

Old Fool, the structure of the feathers IS the auricle.

There are owls in Russia that are neither nocturnal or quiet.

I got this wrong because I was thinking who instead of what....