Valmiki Ramayana Sundara Kanda Sarga 38 Shloka 28

पतताम् of the birds, वरः eminent, सः वायसः that crow, शक्रस्य Indra's, पुत्रः किल it is said that he is the son, धरान्तरगतः he covered a long distance, शीघ्रम् in great speed, गतौ in movement, पवनस्य Windgod's, समः matching.

'This crow was the best of birds. He was surely Indra's son who had covered a long distance with great speed and his speed was like the Windgod's.