When I searched for Kakabhusundi on wikipedia, it was written that -----
The conversations happen between Shiva and Parvati, Sages Bharadwaj and Yajnavalkya and finally Kakbhushundi and the king of birds, Garuda.It has also been said that whenever Lord Rama takes an incarnation on earth in different ages Kalpa (aeon), Kakbhushundi flies away and shift to Ayodhya to watch the child plays of Rama, because of his devotional love for Rama.
But in Devdutt Patnaik's Sita it is written -----
Kakabhusundi had listened the Ramayana from Lord Shiva.
So, which of the above to believe?