Nattravn is a variegated colourway with streaks of blue, purple, green and heavy streaks of black. 

Night ravens are creatures of European folklore, predominantly described as raven-like creatures appearing in the night. The folklore differs regionally, and night ravens may be other beings, such as undead, shapeshifted into ravens.

In Nordic folklore, night ravens (Danish: nattravn, Norwegian: nattravn, Swedish: nattramn), are mostly known from the southern regions of Sweden and Norway, as well as Denmark. Some legends depict them with no eyes, which, if looked into, cause death. Such are also depicted with holes in their wings, which cause illness and disease if looked at.

In Swedish folklore (nattramn, nattkorp), especially of southern Sweden, night ravens are said to be the ghosts of suicide victims or pediciders, dead unbaptized children, or those buried in unholy earth, believed to appear at night in feathered hamr (bird form), and then primarily as ravens, instilling fear around it. They make a creaking sound, like the squeak of old wagon wheels, and never fly closer to the ground than the yoke of oxen.

Whether related to the myth or not, the name night raven has, at least historically, not solely been used in the sense of the monster. According to the Deutsches Wörterbuch and the Swedish Academy's dictionary, the term night raven is also an older Germanic name for nocturnal birds, especially nightjars and owls; still being the Danish (natravn), Norwegian (nattravn) and Icelandic (nátthrafn) term for nightjars.