Malar in the real world means “cheek.” With birds it means the stripe from the beak down across their cheeks (if they had cheeks) which they don’t but which is really their jaw (which they do have. Sort of). It’s also known as the submustachial stripe because it is just below the dark stripe behind the beak or mustache. Malar is used again to describe the dark line below the Malar or the submustachial stripe pretending to be the malar. This is called the malar stripe...or whisker mark...or moustache (spelled that way in honor of a Brit someway involved in this mess.)
All these mustaches present a troubling proposition for birders: they now have a submustachial stripe both above and below the m(o)ustache. To further complicate things, some birds don’t even display an upper mustache making the term submustachial stripe not only doubly illogical but silly. :)
Hang with me here. It gets worse. (Nothing’s ever simple is it?) :)
So it was back to malar which means cheek but is really on the jaw. This raised a few superciliums. Not everyone was pleased. Things got so acrimonious many field guides, not wanting to get dragged into the middle, just quit identifying the field mark altogether. If you have an older bird book, look. The chickens! :)
This called for action. So the Heads of Birding (who can be rather cranky about these things) got together and hammered out a proposal for a new naming system. Here’s what they came up with (according to Sibley at least): malar is to be dropped completely (but don't bet on it). What is now called the malar (by some) is to become the lateral throat stripe. And the winning name for the dark line formerly known as whisker stripe, malar stripe, moustache, or submustachial stripe is….the envelope please… "submustachial stripe." Well. I’m glad that’s settled. :)
So. Did you follow all that?
Why? : )
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Distinguishing Marks: Dark streaking, yellow(ish) eyebrow