Birds alone know correctly about the whereabouts (or plans) of the bonafide seekers, because they are nestled in the abodes of the latter.
Note: By ‘birds’ the poet possibly means “Kiramul Katbin” or the angels posted by Allah on the shoulders of every individual to record his deeds. These ascetic spiritualists are so much absorbed in the Reality and they pass so much time in ecstasy, that their thoughts and acts are not comprehended by the general public.
When the two recording angels record (the deeds of men), one sitting on the right and the other on the left. (17, Qaf).

True seekers still exists, known only to those who are for spiritual realms,
Having found them, they have built their nests close to them.

Only birds know of the true Khhahoris,
Having found them they built nests in their courtyard.