The parent birds became very joyful by observing the soft wings of their children, their chirping, their lovely innocent movements around the nest and their attempts to jump up and fly. Seeing their children happy, the parents were also happy.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तासां पतत्रैः सुस्पर्शैः कूजितैर्मुग्धचेष्टितैः । प्रत्युद्गमैरदीनानां पितरौ मुदमापतुः
tāsāṃ patatraiḥ susparśaiḥ kūjitairmugdhaceṣṭitaiḥ | pratyudgamairadīnānāṃ pitarau mudamāpatuḥ
SB 11.7.60