Valmiki Ramayana Yuddha Kanda Sarga 42 Shloka 36

ते they, बभुः brilliant, शुभनीलाङ्गाः dark limbs, रजनीचराः night rangers, सशङ्खा with conches, इवाम्बुदाः like clouds, विद्युन्मण्डलसन्नद्धाः provided with armour with flashes of lightning, सबलाका accompanied by herons.

The night rangers with their brilliant dark limbs, with conchs, were like dark clouds provided with armour with flashes of lightning and accompanied by herons.