Redhawk Caldera Sunglasses at night.

His ears came all the way forward, curiosity piqued. You can't hear? he asked, jaw slightly agape. Then, as if it would solve matters: YOU CAN'T HEAR?! He bellowed the words at Towhee, trying to make himself into a lupine megaphone.

Then how you unnerstand me? Killdeer continued. I dunno any of these. . . He made sloppy work of ptero back to her (probably signing something lewd, profane, or simply gibberish). 

Wait, did she say that Ma couldn't see?

Whaaaat the fuck. He continued with the signing, though blankly now, as if trying to put puzzle pieces together in his mind. Except they didn't fit. None of them fit.