Mahabharata 12.37.18

भासा हंसाः सुपर्णाश्च चक्रवाका बकाः प्लवाःकङ्को मद्गुश्च गृध्राश्च काकोलूकं तथैव च

bhāsā haṃsāḥ suparṇāśca cakravākā bakāḥ plavāḥkaṅko madguśca gṛdhrāśca kākolūkaṃ tathaiva ca

Our plain-language meaning of this verse is waiting for scholar review.