The black birds soar on wings of shadow, dark amongst the bright
Their raucous calls and swooping games, curry swift delight
Yet wary be the travellers who are taken by the sight
For those dark things sleep with death when roosting for the night.

– an excerpt from a piece talking about the fallen city of Raven Roost, in my fantasy worlds’ far north… and for reference sake, yes, I know the picture is of crows.  I do not currently have a photo of ravens in my catalog.