This current phenomena has been noted by others, but since I happen to be posting reviews of two corvid-centric books this week, I thought I'd make official note of it.
In July of this year Betsey Bird was first to call the trend to my attention with her post, 2011 The Year of the Raven. In my opinion, Mortlock and The Blackhope Enigma have the most concentrated use of corvids as characters and even have central figures in the stories named after them (Lord Corvus and Il Corvo). Here are the covers of a few crow/raven books I have reviewed or will be reviewing soon...
And a few I would like to review!
I can't think of another single person, place or thing that has appeared in so many books in such a short space of time.