Well, I guess what I'm about to say could be the "negative" aspects, but then without the negative how could we have a positive?
Without having all of my references with me to cite, what I know about ravens and crows is historically they have been known to be the harbingers of death. The Morrigan that would fly over the battle fields removing the spirits of the dead to the underworld (for lack of a better term), are represented as crows.
Of course, the ravens at the tower of London are kept with their wings clipped because the without them it is thought that both the monarchy and parlimentary governements would fail.
Hawks, however, I've known as insight and higher spirit communications. Perhaps there is a message coming to you?
On a personal note, I would think that there is a some kind of message for you coming via these birds. My dh's spirit animal is a crow, so whenever there's a flock (murder) about, I know there's something going on with him.
Also, the news of my dd came via a heron.
If I remember right, this is the time of year when the ancients send messages to the living world via birds.
HTH. I'd suggest just keeping your eyes, ears, and heart open.