Bramblepoint I learned that from the pizza man.

Minute communication efforts, such as ear flicks, were not lost on Hydra who spoke this way with her sisters (though not in the same dialect as Towhee's own demonstrations). It was only now, though, she realized that Towhee, too, could articulate things with her ears... though she supposed she might (literally) be reading into something that was not there at all. There was a more important matter at hand, which was Towhee's suggestion. 

That'd be awesome, her tail waved all the more at the thought. Let's do twice a month—this one will count as one for us, where they had double-teamed the dead bobcat, who Hydra now looked to. to make switching it up a regular thing! Though it'd be regular anyway, she meant their practice being more... well, more. It excited Hydra immensely.