Valmiki Ramayana Sundara Kanda Sarga 67 Shloka 10

पतताम् among birds, वरः foremost, सः वायसः that crow, शक्रस्य Indra's, पुत्रः son, किल moving about, धरान्तरगतः all over the earth, शीघ्रम् swiftly, गतौ flying, पवनस्य windgod's speed, समः equal.

'That crow, the foremost of the birds was the son of Indra moving about all over the earth swiftly. His speed matched the Windgod's.