Adverb
By night; nightly.
Source: Webster's dictionarynocturnally active bird Source: Internet
Eagles have been confirmed to attack nocturnally active, burrow-nesting seabird species such as storm petrels and shearwaters by digging out their burrows and feeding on all animals they find inside. Source: Internet
Owls are part of a small group of birds that live nocturnally, but do not use echolocation to guide them in flight in low-light situations. Source: Internet
Typical dew nights are classically considered calm, because the wind transports (nocturnally) warmer air from higher levels to the cold surface. Source: Internet