Three times a day, everyday, for the past week, Solitaire had made the call. Once at daybreak, once at the sun's highest point, and finally at dusk. It was a technique taught to them for those times that far-afield scouting was required, or if anyone got separated. She would find a quiet area, lift her head, and let the rising three-tone melody loose, and then would wait patiently for the next three notes to be returned. For the first six days, there was nothing but silence (or, one morning, the tuneless wail returned by some stranger who had heard her call, and Solitaire had rolled her eyes and kept quiet).
On the seventh day, though, as she had passed through red rolling hills as the sun hung overhead, alone for nearly a week but calm and cool as a crow, the three notes had come back, clear as day. @Warbler - Solitaire had finally found her. Briefly and curtly they coordinated a meeting spot, and there Solitaire was waiting.
There was a small knot in her gut as she waited among the ferns, for while she eagerly anticipated reuniting with her searching partner, Solitaire only had failure to report. Perhaps Warbler had had more luck, but the woman had sung no mention of it, and surely it would have been one of the first things shared. The trail had gone stale a long while back, but Warbler was driven by a selfless determination that Solitaire admired (but found somewhat out of character... she respected the woman, but Shrike's daughter was a prickly sort, so it was nice to see her try so hard to bring their lost songbird back safely) and so the search was continuing even through the winter. Especially through the winter! If Nightingale had gotten herself lost or in danger because they did not find her in time... Solitaire would never forgive herself.
Of course, they needed their lost songbird for the safety of the Caldera - that had been Warbler's reason. While it was an incredibly important cause, requiring no other excuse... Solitaire knew that, privately, she just wanted to see her poor, mind-lost friend again. How would Nightingale survive without their guidance? How had they been so careless as to let her wander so far? The thought of the Caldera's doom was cold and terrifying, but surely they would have brought it on themselves.